diff --git a/.travis.yml b/.travis.yml
index 00dec06d..f719ce86 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,87 +1,83 @@
 language: cpp
-dist: bionic
+dist: focal
 os: linux
 compiler: gcc
-    apt:
-        sources:
-        - ubuntu-toolchain-r-test
-        packages:
-        - build-essential
-        - valgrind
-        - libpng-dev
-        - libboost-serialization-dev
-        - libstdc++6
-        - hwloc
 
-install:  
-  # Install toolchain
-  - export TOOLDIR=$HOME/tools
-  - mkdir -p $TOOLDIR
-  - DESTDIR=$TOOLDIR ./ci/toolchain_install.sh --all
-  # Set environments
-  - export RISCV_TOOLCHAIN_PATH=$TOOLDIR/riscv-gnu-toolchain
-  - export LLVM_POCL=$TOOLDIR/llvm-pocl
-  - export LLVM_VORTEX=$TOOLDIR/llvm-vortex
-  - export VERILATOR_ROOT=$TOOLDIR/verilator
-  - export PATH=$VERILATOR_ROOT/bin:$PATH  
-  - export SV2V_PATH=$TOOLDIR/sv2v
-  - export PATH=$SV2V_PATH/bin:$PATH
-  - export YOSYS_PATH=$TOOLDIR/yosys  
-  - export PATH=$YOSYS_PATH/bin:$PATH  
-  - export POCL_CC_PATH=$TOOLDIR/pocl/compiler
-  - export POCL_RT_PATH=$TOOLDIR/pocl/runtime
-  # build project
-  - cp -r $PWD ../build32 && cd ../build32 && make clean-all && make
-  - cp -r $PWD ../build64 && cd ../build64 && make clean-all && XLEN=64 RISCV_TOOLCHAIN_PATH=$TOOLDIR/riscv64-gnu-toolchain make
+addons:  
+  apt:
+    packages:
+      - build-essential
+      - valgrind
+      - libstdc++6
+
+env:
+  global:
+    - TOOLDIR=$HOME/tools
+
+cache:
+  directories:
+    - $TOOLDIR
+    - $HOME/build32
+    - $HOME/build64
+
+before_install:
+  - if [ ! -d "$TOOLDIR" ] || [ -z "$(ls -A $TOOLDIR)" ]; then  
+      mkdir -p $TOOLDIR;
+      OSDIR=ubuntu/focal ./ci/toolchain_install.sh --all;
+    fi
+  - source ./ci/toolchain_env.sh
 
-# stages ordering
 stages:
+  - setup
   - test
 
 jobs:     
   include:
-    - stage: test
+    - stage: setup
+      script:
+        - rm -rf $HOME/build32 && cp -r $PWD $HOME/build32
+        - rm -rf $HOME/build64 && cp -r $PWD $HOME/build64
+        - make -C $HOME/build32
+        - XLEN=64 RISCV_TOOLCHAIN_PATH=$TOOLDIR/riscv64-gnu-toolchain make -C $HOME/build64
+    - stage: test 
       name: unittest
-      script: cp -r ../build32 ../build32_unittest && cd ../build32_unittest && ./ci/travis_run.py ./ci/regression.sh --unittest
-    - stage: test
+      script: cp -r $HOME/build32 build && cd build && ./ci/travis_run.py ./ci/regression.sh --unittest
+    - stage: test 
       name: isa
-      script: cp -r ../build32 ../build32_isa && cd ../build32_isa && ./ci/travis_run.py ./ci/regression.sh --isa
-    - stage: test
+      script: cp -r $HOME/build32 build && cd build && ./ci/travis_run.py ./ci/regression.sh --isa
+    - stage: test 
       name: isa64
-      script: cp -r ../build64 ../build64_isa && cd ../build64_isa && XLEN=64 RISCV_TOOLCHAIN_PATH=$TOOLDIR/riscv64-gnu-toolchain ./ci/travis_run.py ./ci/regression.sh --isa
-    - stage: test
+      script: cp -r $HOME/build64 build && cd build && XLEN=64 RISCV_TOOLCHAIN_PATH=$TOOLDIR/riscv64-gnu-toolchain ./ci/travis_run.py ./ci/regression.sh --isa
+    - stage: test 
       name: regression
-      script: cp -r ../build32 ../build32_regression && cd ../build32_regression && ./ci/travis_run.py ./ci/regression.sh --regression
-    - stage: test
+      script: cp -r $HOME/build32 build && cd build && ./ci/travis_run.py ./ci/regression.sh --regression
+    - stage: test 
       name: regression64
-      script: cp -r ../build64 ../build64_regression && cd ../build64_regression && XLEN=64 RISCV_TOOLCHAIN_PATH=$TOOLDIR/riscv64-gnu-toolchain ./ci/travis_run.py ./ci/regression.sh --regression
-    - stage: test
+      script: cp -r $HOME/build64 build && cd build && XLEN=64 RISCV_TOOLCHAIN_PATH=$TOOLDIR/riscv64-gnu-toolchain ./ci/travis_run.py ./ci/regression.sh --regression
+    - stage: test 
       name: opencl
-      script: cp -r ../build32 ../build32_opencl && cd ../build32_opencl && ./ci/travis_run.py ./ci/regression.sh --opencl    
-    - stage: test
+      script: cp -r $HOME/build32 build && cd build && ./ci/travis_run.py ./ci/regression.sh --opencl    
+    - stage: test 
       name: cluster
-      script: cp -r ../build32 ../build32_cluster && cd ../build32_cluster && ./ci/travis_run.py ./ci/regression.sh --cluster    
-    - stage: test
+      script: cp -r $HOME/build32 build && cd build && ./ci/travis_run.py ./ci/regression.sh --cluster    
+    - stage: test 
       name: config
-      script: cp -r ../build32 ../build32_config && cd ../build32_config && ./ci/travis_run.py ./ci/regression.sh --config
+      script: cp -r $HOME/build32 build && cd build && ./ci/travis_run.py ./ci/regression.sh --config
     - stage: test
       name: debug
-      script: cp -r ../build32 ../build32_debug && cd ../build32_debug && ./ci/travis_run.py ./ci/regression.sh --debug
-    - stage: test
+      script: cp -r $HOME/build32 build && cd build && ./ci/travis_run.py ./ci/regression.sh --debug
+    - stage: test 
       name: stress0
-      script: cp -r ../build32 ../build32_stress0 && cd ../build32_stress0 && ./ci/travis_run.py ./ci/regression.sh --stress0
-    - stage: test
+      script: cp -r $HOME/build32 build && cd build && ./ci/travis_run.py ./ci/regression.sh --stress0
+    - stage: test 
       name: stress1
-      script: cp -r ../build32 ../build32_stress1 && cd ../build32_stress1 && ./ci/travis_run.py ./ci/regression.sh --stress1
-    - stage: test
+      script: cp -r $HOME/build32 build && cd build && ./ci/travis_run.py ./ci/regression.sh --stress1
+    - stage: test 
       name: synthesis
-      script: cp -r ../build32 ../build32_isa && cd ../build32_isa && ./ci/travis_run.py ./ci/regression.sh --synthesis
-    - stage: test
+      script: cp -r $HOME/build32 build && cd build && ./ci/travis_run.py ./ci/regression.sh --synthesis
+    - stage: test 
       name: synthesis64
-      script: cp -r ../build64 ../build64_isa && cd ../build64_isa && XLEN=64 ./ci/travis_run.py ./ci/regression.sh --synthesis
-    - stage: test
-      name: compiler
-      script: cp -r ../build32 ../build32_compiler && cd ../build32_compiler && ./ci/travis_run.py ./ci/test_compiler.sh
+      script: cp -r $HOME/build64 build && cd build && XLEN=64 ./ci/travis_run.py ./ci/regression.sh --synthesis
             
 after_success:
   # Gather code coverage
diff --git a/README.md b/README.md
index 5a122f91..34343a28 100644
--- a/README.md
+++ b/README.md
@@ -53,18 +53,11 @@ Vortex is a full-stack open-source RISC-V GPGPU.
     $ git clone --recursive https://github.com/vortexgpgpu/vortex.git
     $ cd Vortex
 ### Install prebuilt toolchain
-    $ ./ci/toolchain_install.sh --all
-
     By default, the toolchain will install to /opt folder. 
-    You can install the toolchain to a different directory by overiding DESTDIR.
-
-    $ DESTDIR=$TOOLDIR ./ci/toolchain_install.sh --all
-    $ export VORTEX_HOME=$TOOLDIR/vortex
-    $ export LLVM_VORTEX=$TOOLDIR/llvm-vortex
-    $ export LLVM_POCL=$TOOLDIR/llvm-pocl
-    $ export RISCV_TOOLCHAIN_PATH=$TOOLDIR/riscv-gnu-toolchain
-    $ export VERILATOR_ROOT=$TOOLDIR/verilator
-    $ export PATH=$VERILATOR_ROOT/bin:$PATH 
+    You can install the toolchain to a different directory by overriding TOOLDIR (e.g. export TOOLDIR=$HOME/tools).
+    
+    $ ./ci/toolchain_install.sh --all
+    $ source ./ci/toolchain_env.sh
 ### Build Vortex sources
     $ make -s
 ### Quick demo running vecadd OpenCL kernel on 2 cores
diff --git a/ci/test_compiler.sh b/ci/test_compiler.sh
deleted file mode 100755
index a270a060..00000000
--- a/ci/test_compiler.sh
+++ /dev/null
@@ -1,31 +0,0 @@
-#!/bin/bash
-
-# Copyright © 2019-2023
-# 
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-# http://www.apache.org/licenses/LICENSE-2.0
-# 
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# exit when any command fails
-set -e
-
-# clear POCL cache
-rm -rf ~/.cache/pocl
-
-# force rebuild test kernels
-make -C tests clean-all
-
-# ensure build
-make -s
-
-# run tests
-make -C tests/kernel run-simx
-make -C tests/regression run-simx
-make -C tests/opencl run-simx
\ No newline at end of file
diff --git a/ci/toolchain_env.sh b/ci/toolchain_env.sh
new file mode 100644
index 00000000..4046a6a7
--- /dev/null
+++ b/ci/toolchain_env.sh
@@ -0,0 +1,29 @@
+#!/bin/sh
+
+# Copyright 2023 blaise
+# 
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+TOOLDIR=${TOOLDIR:=/opt}
+
+export RISCV_TOOLCHAIN_PATH=$TOOLDIR/riscv-gnu-toolchain
+export LLVM_POCL=$TOOLDIR/llvm-pocl
+export LLVM_VORTEX=$TOOLDIR/llvm-vortex
+export VERILATOR_ROOT=$TOOLDIR/verilator
+export PATH=$VERILATOR_ROOT/bin:$PATH
+export SV2V_PATH=$TOOLDIR/sv2v
+export PATH=$SV2V_PATH/bin:$PATH
+export YOSYS_PATH=$TOOLDIR/yosys
+export PATH=$YOSYS_PATH/bin:$PATH
+export POCL_CC_PATH=$TOOLDIR/pocl/compiler
+export POCL_RT_PATH=$TOOLDIR/pocl/runtime
diff --git a/ci/toolchain_install.sh b/ci/toolchain_install.sh
index 69c20327..0fa38c36 100755
--- a/ci/toolchain_install.sh
+++ b/ci/toolchain_install.sh
@@ -17,50 +17,50 @@
 set -e
 
 REPOSITORY=https://github.com/vortexgpgpu/vortex-toolchain-prebuilt/raw/master
-
-DESTDIR="${DESTDIR:=/opt}"
+TOOLDIR=${TOOLDIR:=/opt}
+OSDIR=${OSDIR:=ubuntu/bionic}
 
 OS="${OS:=ubuntu/bionic}"
 
 riscv()
 {
-    case $OS in
+    case $OSDIR in
     "centos/7") parts=$(eval echo {a..h}) ;;
     *)          parts=$(eval echo {a..j}) ;;
     esac
     rm -f riscv-gnu-toolchain.tar.bz2.parta*
     for x in $parts
     do
-        wget $REPOSITORY/riscv-gnu-toolchain/$OS/riscv-gnu-toolchain.tar.bz2.parta$x
+        wget $REPOSITORY/riscv-gnu-toolchain/$OSDIR/riscv-gnu-toolchain.tar.bz2.parta$x
     done
     cat riscv-gnu-toolchain.tar.bz2.parta* > riscv-gnu-toolchain.tar.bz2
     tar -xvf riscv-gnu-toolchain.tar.bz2
-    cp -r riscv-gnu-toolchain $DESTDIR
+    cp -r riscv-gnu-toolchain $TOOLDIR
     rm -f riscv-gnu-toolchain.tar.bz2*    
     rm -rf riscv-gnu-toolchain
 }
 
 riscv64()
 {
-    case $OS in
+    case $OSDIR in
     "centos/7") parts=$(eval echo {a..h}) ;;
     *)          parts=$(eval echo {a..j}) ;;
     esac
     rm -f riscv64-gnu-toolchain.tar.bz2.parta*
     for x in $parts
     do
-        wget $REPOSITORY/riscv64-gnu-toolchain/$OS/riscv64-gnu-toolchain.tar.bz2.parta$x
+        wget $REPOSITORY/riscv64-gnu-toolchain/$OSDIR/riscv64-gnu-toolchain.tar.bz2.parta$x
     done
     cat riscv64-gnu-toolchain.tar.bz2.parta* > riscv64-gnu-toolchain.tar.bz2
     tar -xvf riscv64-gnu-toolchain.tar.bz2
-    cp -r riscv64-gnu-toolchain $DESTDIR
+    cp -r riscv64-gnu-toolchain $TOOLDIR
     rm -f riscv64-gnu-toolchain.tar.bz2*    
     rm -rf riscv64-gnu-toolchain
 }
 
 llvm-vortex()
 {
-    case $OS in
+    case $OSDIR in
     "centos/7") parts=$(eval echo {a..b}) ;;
     *)          parts=$(eval echo {a..b}) ;;
     esac
@@ -68,18 +68,18 @@ llvm-vortex()
     rm -f llvm-vortex.tar.bz2.parta*
     for x in $parts
     do
-        wget $REPOSITORY/llvm-vortex/$OS/llvm-vortex.tar.bz2.parta$x
+        wget $REPOSITORY/llvm-vortex/$OSDIR/llvm-vortex.tar.bz2.parta$x
     done
     cat llvm-vortex.tar.bz2.parta* > llvm-vortex.tar.bz2
     tar -xvf llvm-vortex.tar.bz2
-    cp -r llvm-vortex $DESTDIR
+    cp -r llvm-vortex $TOOLDIR
     rm -f llvm-vortex.tar.bz2*    
     rm -rf llvm-vortex
 }
 
 llvm-pocl()
 {
-    case $OS in
+    case $OSDIR in
     "centos/7") parts=$(eval echo {a..b}) ;;
     *)          parts=$(eval echo {a..b}) ;;
     esac
@@ -87,45 +87,45 @@ llvm-pocl()
     rm -f llvm-pocl.tar.bz2.parta*
     for x in $parts
     do
-        wget $REPOSITORY/llvm-pocl/$OS/llvm-pocl.tar.bz2.parta$x
+        wget $REPOSITORY/llvm-pocl/$OSDIR/llvm-pocl.tar.bz2.parta$x
     done
     cat llvm-pocl.tar.bz2.parta* > llvm-pocl.tar.bz2
     tar -xvf llvm-pocl.tar.bz2
-    cp -r llvm-pocl $DESTDIR
+    cp -r llvm-pocl $TOOLDIR
     rm -f llvm-pocl.tar.bz2*    
     rm -rf llvm-pocl
 }
 
 pocl()
 {
-    wget $REPOSITORY/pocl/$OS/pocl.tar.bz2
+    wget $REPOSITORY/pocl/$OSDIR/pocl.tar.bz2
     tar -xvf pocl.tar.bz2
     rm -f pocl.tar.bz2
-    cp -r pocl $DESTDIR
+    cp -r pocl $TOOLDIR
     rm -rf pocl
 }
 
 verilator()
 {
-    wget $REPOSITORY/verilator/$OS/verilator.tar.bz2
+    wget $REPOSITORY/verilator/$OSDIR/verilator.tar.bz2
     tar -xvf verilator.tar.bz2
-    cp -r verilator $DESTDIR
+    cp -r verilator $TOOLDIR
     rm -f verilator.tar.bz2    
     rm -rf verilator
 }
 
 sv2v() 
 {
-    wget $REPOSITORY/sv2v/$OS/sv2v.tar.bz2
+    wget $REPOSITORY/sv2v/$OSDIR/sv2v.tar.bz2
     tar -xvf sv2v.tar.bz2
     rm -f sv2v.tar.bz2
-    cp -r sv2v $DESTDIR
+    cp -r sv2v $TOOLDIR
     rm -rf sv2v
 }
 
 yosys()
 {
-    case $OS in
+    case $OSDIR in
     "centos/7") parts=$(eval echo {a..c}) ;;
     *)          parts=$(eval echo {a..c}) ;;
     esac
@@ -133,11 +133,11 @@ yosys()
     rm -f yosys.tar.bz2.parta*
     for x in $parts
     do
-        wget $REPOSITORY/yosys/$OS/yosys.tar.bz2.parta$x
+        wget $REPOSITORY/yosys/$OSDIR/yosys.tar.bz2.parta$x
     done
     cat yosys.tar.bz2.parta* > yosys.tar.bz2
     tar -xvf yosys.tar.bz2
-    cp -r yosys $DESTDIR
+    cp -r yosys $TOOLDIR
     rm -f yosys.tar.bz2*    
     rm -rf yosys
 }
@@ -160,20 +160,19 @@ while [ "$1" != "" ]; do
                 ;;
         --llvm-vortex ) llvm-vortex
                 ;;
-        --llvm-pocl ) llvm-pocl
+        --llvm-pocl ) llvm-pocl                
                 ;;
         --sv2v ) sv2v
                 ;;
         --yosys ) yosys
                 ;;
-        --all ) riscv
-                riscv64
-                llvm-vortex
-                llvm-pocl
-                pocl
+        --all ) pocl
                 verilator
                 sv2v
                 yosys
+                llvm-vortex
+                riscv
+                riscv64                
                 ;;
         -h | --help ) show_usage
                 exit
diff --git a/ci/toolchain_prebuilt.sh b/ci/toolchain_prebuilt.sh
index acd5fb3f..d819858a 100755
--- a/ci/toolchain_prebuilt.sh
+++ b/ci/toolchain_prebuilt.sh
@@ -16,77 +16,72 @@
 # exit when any command fails
 set -e
 
-OS_DIR=${OS_DIR:-'ubuntu/bionic'}
-SRCDIR=${SRCDIR:-'/opt'}
-DESTDIR=${DESTDIR:-'.'}
-
-echo "OS_DIR=${OS_DIR}"
-echo "SRCDIR=${SRCDIR}"
-echo "DESTDIR=${DESTDIR}"
+TOOLDIR=${TOOLDIR:=/opt}
+OSDIR=${OSDIR:=ubuntu/bionic}
 
 riscv() 
 {
     echo "prebuilt riscv-gnu-toolchain..."
-    tar -C $SRCDIR -cvjf riscv-gnu-toolchain.tar.bz2 riscv-gnu-toolchain
+    tar -C $TOOLDIR -cvjf riscv-gnu-toolchain.tar.bz2 riscv-gnu-toolchain
     split -b 50M riscv-gnu-toolchain.tar.bz2 "riscv-gnu-toolchain.tar.bz2.part"    
-    mv riscv-gnu-toolchain.tar.bz2.part* $DESTDIR/riscv-gnu-toolchain/$OS_DIR
+    mv riscv-gnu-toolchain.tar.bz2.part* ./riscv-gnu-toolchain/$OSDIR
     rm riscv-gnu-toolchain.tar.bz2
 }
 
 riscv64() 
 {
     echo "prebuilt riscv64-gnu-toolchain..."
-    tar -C $SRCDIR -cvjf riscv64-gnu-toolchain.tar.bz2 riscv64-gnu-toolchain
+    tar -C $TOOLDIR -cvjf riscv64-gnu-toolchain.tar.bz2 riscv64-gnu-toolchain
     split -b 50M riscv64-gnu-toolchain.tar.bz2 "riscv64-gnu-toolchain.tar.bz2.part"    
-    mv riscv64-gnu-toolchain.tar.bz2.part* $DESTDIR/riscv64-gnu-toolchain/$OS_DIR
+    mv riscv64-gnu-toolchain.tar.bz2.part* ./riscv64-gnu-toolchain/$OSDIR
     rm riscv64-gnu-toolchain.tar.bz2
 }
 
 llvm-vortex() 
 {
     echo "prebuilt llvm-vortex..."
-    tar -C $SRCDIR -cvjf llvm-vortex.tar.bz2 llvm-vortex
+    tar -C $TOOLDIR -cvjf llvm-vortex.tar.bz2 llvm-vortex
     split -b 50M llvm-vortex.tar.bz2 "llvm-vortex.tar.bz2.part"    
-    mv llvm-vortex.tar.bz2.part* $DESTDIR/llvm-vortex/$OS_DIR
+    mv llvm-vortex.tar.bz2.part* ./llvm-vortex/$OSDIR
     rm llvm-vortex.tar.bz2
 }
 
 llvm-pocl() 
 {
     echo "prebuilt llvm-pocl..."
-    tar -C $SRCDIR -cvjf llvm-pocl.tar.bz2 llvm-pocl
+    tar -C $TOOLDIR -cvjf llvm-pocl.tar.bz2 llvm-pocl
     split -b 50M llvm-pocl.tar.bz2 "llvm-pocl.tar.bz2.part"    
-    mv llvm-pocl.tar.bz2.part* $DESTDIR/llvm-pocl/$OS_DIR
+    mv llvm-pocl.tar.bz2.part* ./llvm-pocl/$OSDIR
     rm llvm-pocl.tar.bz2
 }
 
 pocl() 
 {
     echo "prebuilt pocl..."
-    tar -C $SRCDIR -cvjf pocl.tar.bz2 pocl
-    mv pocl.tar.bz2 $DESTDIR/pocl/$OS_DIR
+    tar -C $TOOLDIR -cvjf pocl.tar.bz2 pocl
+    mv pocl.tar.bz2 ./pocl/$OSDIR
 }
 
 verilator() 
 {
     echo "prebuilt verilator..."
-    tar -C $SRCDIR -cvjf verilator.tar.bz2 verilator
-    mv verilator.tar.bz2 $DESTDIR/verilator/$OS_DIR
+    tar -C $TOOLDIR -cvjf verilator.tar.bz2 verilator
+    mv verilator.tar.bz2 ./verilator/$OSDIR
 }
 
 sv2v() 
 {
     echo "prebuilt sv2v..."
-    tar -C $SRCDIR -cvjf sv2v.tar.bz2 sv2v
-    mv sv2v.tar.bz2 $DESTDIR/sv2v/$OS_DIR
+    tar -C $TOOLDIR -cvjf sv2v.tar.bz2 sv2v
+    mv sv2v.tar.bz2 ./sv2v/$OSDIR
 }
 
 yosys()
 {
     echo "prebuilt yosys..."
-    tar -C $SRCDIR -cvjf yosys.tar.bz2 yosys
+    tar -C $TOOLDIR -cvjf yosys.tar.bz2 yosys
     split -b 50M yosys.tar.bz2 "yosys.tar.bz2.part"    
-    mv yosys.tar.bz2.part* $DESTDIR/yosys/$OS_DIR
+    mv yosys.tar.bz2.part* ./yosys/$OSDIR
     rm yosys.tar.bz2
 }
 
diff --git a/ci/travis_run.py b/ci/travis_run.py
index eaa85275..f55a4b0a 100755
--- a/ci/travis_run.py
+++ b/ci/travis_run.py
@@ -21,7 +21,7 @@ import subprocess
 # This script executes a long-running command while outputing "still running ..." periodically
 # to notify Travis build system that the program has not hanged
 
-PING_INTERVAL=15
+PING_INTERVAL=300 # 5 minutes
 
 def monitor(stop):
     wait_time = 0    
diff --git a/sim/opaesim/Makefile b/sim/opaesim/Makefile
index 439b41b3..3b906bc5 100644
--- a/sim/opaesim/Makefile
+++ b/sim/opaesim/Makefile
@@ -116,7 +116,7 @@ CXXFLAGS += -DNOPAE
 
 PROJECT = libopae-c-sim.so
 
-all: $(PROJECT)
+all: $(DESTDIR)/$(PROJECT)
 
 $(DESTDIR)/vortex.xml:
 	verilator --xml-only -O0 $(VL_FLAGS) $(TOP) --xml-output $(DESTDIR)/vortex.xml
diff --git a/sim/rtlsim/Makefile b/sim/rtlsim/Makefile
index 1dd8a731..1d43ea4f 100644
--- a/sim/rtlsim/Makefile
+++ b/sim/rtlsim/Makefile
@@ -85,7 +85,7 @@ endif
 
 PROJECT = rtlsim
 
-all: $(PROJECT)
+all: $(DESTDIR)/$(PROJECT)
 
 $(DESTDIR)/$(PROJECT): $(SRCS) main.cpp
 	verilator --build $(VL_FLAGS) $^ -CFLAGS '$(CXXFLAGS) -DSTARTUP_ADDR=0x80000000' -LDFLAGS '$(LDFLAGS)' -o ../$@
diff --git a/tests/opencl/common.mk b/tests/opencl/common.mk
index 8a3dc21e..fc55ee0a 100644
--- a/tests/opencl/common.mk
+++ b/tests/opencl/common.mk
@@ -38,6 +38,7 @@ K_LDFLAGS  += -Wl,-Bstatic,--gc-sections,-T$(VORTEX_KN_PATH)/linker/vx_link$(XLE
 
 CXXFLAGS += -std=c++11 -Wall -Wextra -Wfatal-errors
 CXXFLAGS += -Wno-deprecated-declarations -Wno-unused-parameter -Wno-narrowing
+CXXFLAGS += -pthread
 CXXFLAGS += -I$(POCL_RT_PATH)/include
 LDFLAGS  += -L$(POCL_RT_PATH)/lib -L$(VORTEX_RT_PATH)/stub -lvortex