+function add_include {
+# adds a include directory
+# parameter:
+# $1: main directory
+# $2: include dir
+
+ src=$(pwd)
+ echo "CXXFLAGS += -I$src/$2" >> $1/make.pre
+}
+
+function add_library {
+# adds a extern library
+# parameter:
+# $1: main directory
+# $2: library name (without l or lib )
+
+ src=$(pwd)
+ echo "EXTLIB += -l$2" >> $1/make.pre
+}
+