diff --git a/PCLib/GNUmakefile b/PCLib/GNUmakefile
index 3435f1a..2d7e66d 100644
--- a/PCLib/GNUmakefile
+++ b/PCLib/GNUmakefile
@@ -22,6 +22,8 @@
 #  Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
 #
 
+GNUSTEP_INSTALLATION_DIR = $(GNUSTEP_SYSTEM_ROOT)
+
 PCLIB_INSTALLATION_DIR = $(GNUSTEP_INSTALLATION_DIR)
 GNUSTEP_MAKEFILES = $(GNUSTEP_SYSTEM_ROOT)/Makefiles