diff --git a/ChangeLog b/ChangeLog
index 7ef47235e1..78daa12c70 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,7 +1,10 @@
-Wed Nov 14 01:52:59 2007  Tanaka Akira  <akr@fsij.org>
+Wed Nov 14 02:11:38 2007  Tanaka Akira  <akr@fsij.org>
 
 	* missing/isinf.c (isinf): don't define is the macro is defined.
 
+	* configure.in: no need to set ac_cv_func_isinf=yes on non-gcc
+	  solaris.
+
 Wed Nov 14 01:34:42 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* numeric.c (round): fallback definition.
diff --git a/configure.in b/configure.in
index a1b82d1cfb..8788847ac3 100644
--- a/configure.in
+++ b/configure.in
@@ -507,11 +507,6 @@ bow)		ac_cv_func_setitimer=no
 		;;
 superux*)     ac_cv_func_setitimer=no
               ;;
-solaris*2.1*) if test -z "$GCC"; then
-	           ac_cv_func_isinf=yes
-              fi
-              LIBS="-lm $LIBS"
-              ;;
 *) LIBS="-lm $LIBS";;
 esac
 AC_CHECK_LIB(crypt, crypt)