diff -ur --unidirectional-new-file skipsrc-1.0.orig/skip/tools/skiptool/Makefile skipsrc-1.0/skip/tools/skiptool/Makefile
--- skipsrc-1.0.orig/skip/tools/skiptool/Makefile	Fri Oct 25 13:13:05 1996
+++ skipsrc-1.0/skip/tools/skiptool/Makefile	Tue Nov 25 18:08:50 1997
@@ -97,11 +97,15 @@
 
 # Compiler flags.
 
+PREFIX?=	/usr/local
+
 DYNAMIC_PATH	= $(DYNAMIC_$(OSNAME))
 CFLAGS 		+= $(U_DEBUG) $(OS) -DSKIP_RELEASE="\"$(SKIP_RELEASE)\""
 SKIPINC_DIR 	=  -I../lib -I$(COMM_INC) -I$(DRVDIR)
 CPPFLAGS 	+= -I$(WIN_HOME)/include -DMAIN $(SKIPINC_DIR)
 CPPFLAGS 	+= -I$(WIN_HOME)/include/pixrect
+CPPFLAGS 	+= -I${PREFIX}/include
+CPPFLAGS 	+= -I${PREFIX}/include/pixrect
 LDFLAGS 	+= -L$(WIN_HOME)/lib $(DYNAMIC_PATH)
 LDLIBS 		+= ../lib/$(SKIP_LIB) $(OS_LIB) -lxview -lolgx -lX11