diff --git a/build.sh b/build.sh
index 9147b46..f47db03 100755
--- a/build.sh
+++ b/build.sh
@@ -1,8 +1,19 @@
-#!/bin/bash
-PROJECT_DIR=$(pwd)
-CFLAGS="-pedantic -s -Os -flto -Werror -Wall -Wextra -I$PROJECT_DIR -I$PROJECT_DIR/include/libmu -lm"
-projects="console-tools coreutils sysutils sysutils-linux findutils networking miscutils shell loginutils procps"
-CC=cc
+#!/bin/sh
+if [ -z $PROJECT_DIR ]; then
+	PROJECT_DIR=$(pwd)
+fi
+
+if [ -z $CFLAGS ]; then
+	CFLAGS="-pedantic -s -Os -flto -Werror -Wall -Wextra -I$PROJECT_DIR -I$PROJECT_DIR/include/libmu -lm"
+fi
+
+if [ -z $CC ]; then
+	CC=cc
+fi
+
+if [ -z $projects ]; then
+	projects="console-tools coreutils sysutils sysutils-linux findutils networking miscutils shell loginutils procps"
+fi
 
 #Compile
 for project in $projects; do