diff --git a/install/GNUmakefile b/install/GNUmakefile
index 6eb3768debcb3ed6e4def9c0e32916a0fc0aea62..576e35ba0ce915a40c7fabbbb9ac0b4fb2000f09 100644
--- a/install/GNUmakefile
+++ b/install/GNUmakefile
@@ -17,7 +17,8 @@
 # SBBSUSER = Owner for the installed files
 # SBBSGROUP = Group for the installed files
 # NOCVS	= do not do CVS update
-# JSLIB = Full path and filename to JavaScript library.
+# JSLIB = Library name of JavaScript library.
+# JSLIBDIR = Full path to JavaScript library
 # CVSTAG = CVS tag to pull
 # NO_X = Don't include build conio library (ciolib) for X
 # NO_GLADE = Don't build Glade-based sysop tools
@@ -86,6 +87,10 @@ ifdef JSLIB
  MKFLAGS	+=	JSLIB=$(JSLIB)
 endif
 
+ifdef JSLIBDIR
+ MKFLAGS	+=	JSLIBDIR=$(JSLIBDIR)
+endif
+
 ifdef NO_X
  MKFLAGS	+=	NO_X=$(NO_X)
 endif