diff --git a/build-cmake.sh b/build-cmake.sh
index 1946a67..7dd65dc 100755
--- a/build-cmake.sh
+++ b/build-cmake.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 set -eu
-cmake -B build -DCMAKE_INSTALL_PREFIX="${PREFIX:-$PWD}"
+prefix="${PREFIX:-$PWD}"
+cmake -B build -DCMAKE_INSTALL_PREFIX="$prefix"
 cmake --build build
 cmake --install build
-(test -d lib64 && ln -f -s lib64 lib) || true
+(cd "$prefix" && test -d lib64 && ln -f -s lib64 lib) || true
diff --git a/build-meson.sh b/build-meson.sh
index d6364b7..9df5810 100755
--- a/build-meson.sh
+++ b/build-meson.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 set -eu
-meson setup build --prefix="${PREFIX:-$PWD}"
+prefix="${PREFIX:-$PWD}"
+meson setup build --prefix="$prefix"
 meson compile -C build
 meson install -C build
-(test -d lib64 && ln -f -s lib64 lib) || true
+(cd "$prefix" && test -d lib64 && ln -f -s lib64 lib) || true