kc3-lang/libffi

diff --git a/.ci/build.sh b/.ci/build.sh
index 4f88ec7..a0d6428 100755
--- a/.ci/build.sh
+++ b/.ci/build.sh
@@ -3,7 +3,7 @@
 set -x
 
 # Special build tools are here...
-export PATH=~/i/bin:$PATH
+export PATH=$HOME/i/bin:$PATH
 
 # This is a policy bound API key.  It can only be used with
 # https://github.com/libffi/rlgl-policy.git.
diff --git a/.ci/install.sh b/.ci/install.sh
index 9bdf97b..9d50fbc 100755
--- a/.ci/install.sh
+++ b/.ci/install.sh
@@ -39,7 +39,7 @@ else
     set -x
     wget -qO - https://ftpmirror.gnu.org/autoconf/autoconf-2.71.tar.gz | tar -xvzf -
     mkdir -p ~/i
-    (cd autoconf-2.71; ./configure --prefix=~/i; make; make install)
+    (cd autoconf-2.71; ./configure --prefix=$HOME/i; make; make install)
 
     case $HOST in
 	mips64el-linux-gnu | sparc64-linux-gnu)