diff --git a/compile_debug.sh b/compile_debug.sh
index 3de0d9a..119e43c 100755
--- a/compile_debug.sh
+++ b/compile_debug.sh
@@ -1 +1,9 @@
-cmake -G "Unix Makefiles" -H. -Bbuild -DCMAKE_BUILD_TYPE=Debug && cmake --build build -- -j$(nproc)
+#!/bin/sh
+
+if ! [ -x "$(command -v nproc)" ]; then
+	BUILD_PROC=1
+else
+	BUILD_PROC=$(nproc)
+fi
+
+cmake -G "Unix Makefiles" -H. -Bbuild -DCMAKE_BUILD_TYPE=Debug && cmake --build build -- -j $BUILD_PROC