diff --git a/src/Makefile b/src/Makefile
index 08fec6c..3f5dd44 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -3,7 +3,7 @@ PREFIX	= /usr/local
 DESTDIR	= 
 BINDIR	= $(PREFIX)/bin
 CC	= cc
-CPPFLAGSF=
+CPPFLAGSF= -I $(PREFIX)/include
 CPPFLAGS=
 CFLAGSF	= -W
 CFLAGS	= -Wall -g -O2 -pedantic
diff --git a/src/project.conf b/src/project.conf
index 932abb1..4b9d577 100644
--- a/src/project.conf
+++ b/src/project.conf
@@ -1,4 +1,5 @@
 targets=configure,makedepend
+cppflags_force=-I $(PREFIX)/include
 cflags_force=-W
 cflags=-Wall -g -O2 -pedantic
 ldflags_force=-L $(PREFIX)/lib -Wl,-rpath,$(PREFIX)/lib -lSystem