--- build/UNX/Makefile_gnu.orig	2005-06-11 11:28:05.000000000 -0700
+++ build/UNX/Makefile_gnu	2005-06-11 12:12:44.000000000 -0700
@@ -27,6 +27,14 @@
 INCLUDE = -I../../source/moldyn
 endif
 
+# options for compilation with APBS
+ifdef APBS
+# these must be defined: APBS_LIB, IAPBS_LIB and APBS_BLAS
+ADDLIB := $(ADDLIB) $(IAPBS_LIB)/iapbs.a \
+        -L$(APBS_LIB) -lapbsmainroutines -lapbs -lmaloc $(APBS_BLAS)
+
+endif
+
 RANLIB = ranlib
 .SUFFIXES: .fcm .src .o
 VPATH = fcm
