diff -Naur libtommath-0.41/makefile libtommath-0.41-new/makefile
--- libtommath-0.41/makefile	2007-03-10 15:45:11.000000000 -0800
+++ libtommath-0.41-new/makefile	2007-06-03 00:50:44.000000000 -0700
@@ -53,8 +53,12 @@
 #INCPATH-The directory to install the header files for libtommath.
 #DATAPATH-The directory to install the pdf docs.
 DESTDIR=
-LIBPATH=/usr/lib
-INCPATH=/usr/include
+ifndef LIBPATH
+   LIBPATH=/usr/lib
+endif
+ifndef INCPATH
+   INCPATH=/usr/include
+endif
 DATAPATH=/usr/share/doc/libtommath/pdf
 
 OBJECTS=bncore.o bn_mp_init.o bn_mp_clear.o bn_mp_exch.o bn_mp_grow.o bn_mp_shrink.o \