diff --git a/container/install_script.sh b/container/install_script.sh
index 40973e8..c7cf270 100644
--- a/container/install_script.sh
+++ b/container/install_script.sh
@@ -101,7 +101,7 @@ cd rust-1.49.0-x86_64-unknown-linux-gnu
 
 # install scala
 # final binary: /opt/scala/scala3-3.0.0-M3/bin/scala
-# get version: /opt/scala/scala3-3.0.0-M3/bin/scala -version
+# get version: /opt/scala/scala3-3.0.0-M3/bin/scalac -version
 cd /opt && mkdir scala && cd scala
 wget https://github.com/lampepfl/dotty/releases/download/3.0.0-M3/scala3-3.0.0-M3.tar.gz
 tar -xzf scala3-3.0.0-M3.tar.gz
diff --git a/lxc/executors/c b/lxc/executors/c
index e0806f3..e849a08 100755
--- a/lxc/executors/c
+++ b/lxc/executors/c
@@ -1,5 +1,5 @@
 #!/usr/bin/bash
 
 cd /tmp/$1
-timeout -s KILL 10 gcc -std=c11 -o binary -x c code.code
+timeout -s KILL 10 gcc -std=c11 -o binary -x c code.code -lm
 timeout -s KILL 3 xargs -a args.args -d '\n' ./binary < stdin.stdin
diff --git a/lxc/util/versions b/lxc/util/versions
index f86b563..6ff9d54 100755
--- a/lxc/util/versions
+++ b/lxc/util/versions
@@ -130,7 +130,7 @@ lxc-attach --clear-env -n piston -- /bin/bash -l -c "rustc --version"
 echo '---'
 
 echo 'scala'
-lxc-attach --clear-env -n piston -- /bin/bash -l -c "scala -version"
+lxc-attach --clear-env -n piston -- /bin/bash -l -c "scalac -version"
 echo '---'
 
 echo 'swift'