diff --git a/ChangeLog b/ChangeLog
index 6d0eadc428..72656f12f8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,6 @@
-Mon Jun  9 13:27:13 2003  Nobuyoshi Nakada  <nobu.nokada@softhome.net>
+Mon Jun  9 19:02:33 2003  Nobuyoshi Nakada  <nobu.nokada@softhome.net>
+
+	* configure.in: checks presence of grp.h and setgroups().
 
 	* process.c (proc_getgroups, proc_setgroups): raise
 	  NotImplementedError unless available.  [ruby-talk:73014]
diff --git a/configure.in b/configure.in
index c922fabb52..789c21cb63 100644
--- a/configure.in
+++ b/configure.in
@@ -352,7 +352,7 @@ AC_HEADER_STDC
 AC_HEADER_SYS_WAIT
 AC_CHECK_HEADERS(stdlib.h string.h unistd.h limits.h sys/file.h sys/ioctl.h\
 		 fcntl.h sys/fcntl.h sys/select.h sys/time.h sys/times.h sys/param.h\
-		 syscall.h pwd.h a.out.h utime.h memory.h direct.h sys/resource.h \
+		 syscall.h pwd.h grp.h a.out.h utime.h memory.h direct.h sys/resource.h \
 		 sys/mkdev.h sys/utime.h float.h)
 
 dnl Checks for typedefs, structures, and compiler characteristics.
@@ -376,7 +376,7 @@ AC_CHECK_FUNCS(fmod killpg wait4 waitpid syscall chroot fsync\
 	      truncate chsize times utimes fcntl lockf lstat symlink readlink\
 	      setitimer setruid seteuid setreuid setresuid setproctitle\
 	      setrgid setegid setregid setresgid pause lchown lchmod\
-	      getpgrp setpgrp getpgid setpgid getgroups getpriority getrlimit\
+	      getpgrp setpgrp getpgid setpgid getgroups setgroups getpriority getrlimit\
 	      dlopen sigprocmask sigaction _setjmp setsid telldir seekdir fchmod\
 	      mktime timegm cosh sinh tanh)
 AC_STRUCT_TIMEZONE
diff --git a/process.c b/process.c
index 0fffb6df6f..972c9e8eed 100644
--- a/process.c
+++ b/process.c
@@ -45,7 +45,7 @@ struct timeval rb_time_interval _((VALUE));
 #include <sys/times.h>
 #endif
 
-#ifdef HAVE_GETGROUPS
+#ifdef HAVE_GRP_H
 #include <grp.h>
 #endif
 
@@ -1255,7 +1255,7 @@ proc_getgroups(VALUE obj)
 static VALUE
 proc_setgroups(VALUE obj, VALUE ary)
 {
-#ifdef HAVE_GETGROUPS
+#ifdef HAVE_SETGROUPS
     size_t ngroups;
     gid_t *groups;
     int i;