diff --git a/scripts/centos-req.sh b/scripts/centos-req.sh
index 1a1439d1..932be240 100755
--- a/scripts/centos-req.sh
+++ b/scripts/centos-req.sh
@@ -4,7 +4,13 @@ set -ex
 
 sudo yum groupinstall -y "Development tools"
 sudo yum install -y gmp-devel mpfr-devel libmpc-devel zlib-devel vim git java java-devel
-curl https://bintray.com/sbt/rpm/rpm | sudo tee /etc/yum.repos.d/bintray-sbt-rpm.repo
+
+# Install SBT https://www.scala-sbt.org/release/docs/Installing-sbt-on-Linux.html#Red+Hat+Enterprise+Linux+and+other+RPM-based+distributions
+# sudo rm -f /etc/yum.repos.d/bintray-rpm.repo
+# Use rm above if sbt installed from bintray before.
+curl -L https://www.scala-sbt.org/sbt-rpm.repo > sbt-rpm.repo
+sudo mv sbt-rpm.repo /etc/yum.repos.d/
+
 sudo yum install -y sbt texinfo gengetopt
 sudo yum install -y expat-devel libusb1-devel ncurses-devel cmake "perl(ExtUtils::MakeMaker)"
 # deps for poky
@@ -24,4 +30,4 @@ sudo yum install -y python
 git clone http://git.veripool.org/git/verilator
 cd verilator
 git checkout v4.034
-autoconf && ./configure && make -j16 && sudo make install
+autoconf && ./configure && make -j$(nproc) && sudo make install
diff --git a/scripts/ubuntu-req.sh b/scripts/ubuntu-req.sh
index 4889dc48..058afbfd 100755
--- a/scripts/ubuntu-req.sh
+++ b/scripts/ubuntu-req.sh
@@ -2,10 +2,10 @@
 
 set -ex
 
-sudo apt-get install -y build-essential bison flex software-properties-common
+sudo apt-get install -y build-essential bison flex software-properties-common curl
 sudo apt-get install -y libgmp-dev libmpfr-dev libmpc-dev zlib1g-dev vim default-jdk default-jre
-# install sbt: https://www.scala-sbt.org/release/docs/Installing-sbt-on-Linux.html
-echo "deb https://dl.bintray.com/sbt/debian /" | sudo tee -a /etc/apt/sources.list.d/sbt.list
+# install sbt: https://www.scala-sbt.org/release/docs/Installing-sbt-on-Linux.html#Ubuntu+and+other+Debian-based+distributions
+echo "deb https://repo.scala-sbt.org/scalasbt/debian /" | sudo tee -a /etc/apt/sources.list.d/sbt.list
 curl -sL "https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x2EE0EA64E40A89B84B2DF73499E82A75642AC823" | sudo apt-key add
 sudo apt-get update
 sudo apt-get install -y sbt
@@ -26,6 +26,7 @@ sudo apt-get update
 sudo apt-get install git -y
 
 # install verilator
+sudo apt-get install -y autoconf
 git clone http://git.veripool.org/git/verilator
 cd verilator
 git checkout v4.034