Use unified diff

diff --git a/aclocal.m4 b/aclocal.m4
index 35eb79c..ccb2530 100644 (file)
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -100,7 +100,7 @@ AC_DEFUN([FP_PROG_CONTEXT_DIFF],
 [echo foo > conftest1
 echo foo > conftest2
 fp_cv_context_diff=no
-for fp_var in '-C 1' '-c1'
+for fp_var in '-U 1' '-u1' '-C 1' '-c1'
 do
   if diff $fp_var conftest1 conftest2 > /dev/null 2>&1; then
     fp_cv_context_diff="diff $fp_var"