--- ./Makefile.orig	1997-10-13 21:25:38.000000000 +0200
+++ ./Makefile	2008-04-13 18:59:23.000000000 +0200
@@ -1,10 +1,13 @@
 # New Makefile for apc (13 October 1997)
 #
-CFLAGS+=-DOS=\"$(OSTYPE)\" -I${X11BASE}/include
-LDFLAGS+=-L${X11BASE}/lib
-LDADD+=-lxforms -lX11 -lm
-BINDIR=${X11BASE}/bin
-MANDIR=${X11BASE}/man/man
+.if exists(${LOCALBASE}/include/X11/forms.h)
+XFORMSINC=-I${LOCALBASE}/include/X11
+.endif
+CFLAGS+=-DOS=\"$(OSTYPE)\" -I${LOCALBASE}/include ${XFORMSINC}
+LDFLAGS+=-L${LOCALBASE}/lib
+LDADD+=-lforms -lX11 -lm -lXpm
+BINDIR=${LOCALBASE}/bin
+MANDIR=${LOCALBASE}/man/man
 PROG=	apc
 SRCS=	about.c apc.c calculate.c main.c mathfun.c setfns.c