Remove redundant checks for string.h, strings.h and unistd.h

diff --git a/configure.in b/configure.in
index e0dfd51534b3ade744e2613e7bcba66ce8f330d5..fe01ab8bc0b59a050d628d41b039086622338fd5 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -1513,7 +1513,7 @@ dnl Header file checks
 dnl
 AC_HEADER_STDC
 AC_HEADER_DIRENT
-AC_CHECK_HEADERS(string.h strings.h unistd.h malloc.h paths.h utime.h netgroup.h sys/sockio.h sys/bsdtypes.h sys/select.h)
+AC_CHECK_HEADERS(malloc.h paths.h utime.h netgroup.h sys/sockio.h sys/bsdtypes.h sys/select.h)
 dnl ultrix termio/termios are broken
 if test "$OS" != "ultrix"; then
     AC_CHECK_HEADERS(termio.h)