diff --git a/lisp/Config.linux_gencgc b/lisp/Config.linux_gencgc
index e049086ff8058d4083dbecd332fa3da53f41e0ad..22c67f944d619a53e37b5e8a4dec46f53e1b0504 100644
--- a/lisp/Config.linux_gencgc
+++ b/lisp/Config.linux_gencgc
@@ -20,7 +20,7 @@ endif
 
 RUNTIME = $(GENCGC) $(LINKAGE)
 # __NO_CTYPE so builds on glibc 2.3 will run on (some) older glibc's.
-CPPFLAGS = -D__NO_CTYPE -I. -I$(PATH2) -I$(PATH1) -I- -I/usr/X11R6/include $(RUNTIME)
+CPPFLAGS = -D__NO_CTYPE -I. -I$(PATH1) -I- -I/usr/X11R6/include $(RUNTIME)
 CFLAGS = -rdynamic -Wstrict-prototypes -Wall -g $(RUNTIME)
 ASFLAGS = -g -DGENCGC -DLINKAGE_TABLE
 NM = $(PATH1)/linux-nm