diff --git a/configure.in b/configure.in
index 0b81ac9..8b86b5d 100644
--- a/configure.in
+++ b/configure.in
@@ -222,7 +222,7 @@
 dnl handle --enable-gcc-wall
 dnl
 AC_ARG_ENABLE([gcc-wall],
-[  --enable-gcc-wall	  enable GCC anal warnings],
+[  --enable-gcc-wall	  enable GCC anal warnings (DON'T USE IN PRODUCTION)],
 if test "$enableval" = "no"
 then
 	W=#
@@ -335,6 +335,23 @@
   AC_DEFINE(HAVE_DIRENT_NAMLEN)
 fi
 dnl
+dnl Check to see if llseek() is declared in unistd.h.  On some libc's 
+dnl it is, and on others it isn't..... Thank you glibc developers....
+dnl
+dnl Warning!  Use of --enable-gcc-wall may throw off this test.
+dnl
+dnl
+AC_MSG_CHECKING(whether llseek declared in unistd.h)
+AC_CACHE_VAL(e2fsprogs_cv_have_llseek_prototype,
+	AC_TRY_COMPILE(
+[#include <unistd.h>], [extern int llseek(int);],
+	[e2fsprogs_cv_have_llseek_prototype=no],
+	[e2fsprogs_cv_have_llseek_prototype=yes]))
+AC_MSG_RESULT($e2fsprogs_cv_have_llseek_prototype)
+if test "$e2fsprogs_cv_have_llseek_prototype" = yes; then
+   AC_DEFINE(HAVE_LLSEEK_PROTOTYPE)
+fi
+dnl
 dnl Word sizes...
 dnl
 if test "$cross_compiling" = yes -a "$ac_cv_sizeof_long" = ""; then