2 files changed, 60 insertions, 0 deletions
diff --git a/source4/lib/ldb/configure.in b/source4/lib/ldb/configure.ac
index 5ef3d1cc96..5ef3d1cc96 100644
--- a/source4/lib/ldb/configure.in
+++ b/source4/lib/ldb/configure.ac
diff --git a/source4/lib/ldb/replace.m4 b/source4/lib/ldb/replace.m4
new file mode 100644
index 0000000000..e06cb7e85a
--- /dev/null
+++ b/source4/lib/ldb/replace.m4
@@ -0,0 +1,60 @@
+dnl Try to find a replacement library
+dnl Will define HAVE_REPLACE_H if replace.h can be found
+AC_DEFUN([SMB_LIBREPLACE], [
+AC_ARG_WITH(libreplace, 
+[ --with-libreplace					Specify location to libreplace],
+[
+ 	# Check whether libreplace can actually be found in this location
+	if ! test -f "$withval/replace.h"
+	then
+		AC_MSG_ERROR([Unable to find replace.h in $withval])
+	fi
+	replacedir=$withval
+],
+[
+	# Check if we can find libreplace in a common location
+	for dir in . replace ../replace
+	do
+		AC_MSG_CHECKING([for libreplace in $dir])
+		if test -f "$dir/replace.h"
+		then
+			replacedir="$dir"
+			AC_MSG_RESULT(yes)
+			break
+		fi
+		AC_MSG_RESULT(no)
+	done
+])
+
+AC_SUBST(REPLACE_LIB)
+AC_SUBST(REPLACE_DIR)
+
+if test "$replacedir" != ""
+then
+	REPLACE_DIR="$replacedir"
+	REPLACE_LIB="$replacedir/libreplace.a"
+	CFLAGS="$CFLAGS -I$replacedir"
+	AC_DEFINE(HAVE_REPLACE_H, 1, 
+		  [Whether replace.h is present and should be used])
+fi
+])
+
+dnl Try to find the specified functions in the system, or 
+dnl in Samba's replacement library. In the future, this may also 
+dnl try to find these functions in libroken or GNUlib if libreplace can't be 
+dnl found.
+AC_DEFUN(SMB_REPLACE_FUNCS, [
+		 AC_REQUIRE([SMB_LIBREPLACE])dnl
+
+		 if test -z "$replacedir" || test -f "$replacedir/libreplace.a"
+		 then
+		 	 LIBS="$LIBS $REPLACE_LIB"
+			 for f in $1
+			 do
+				AC_CHECK_FUNC($f, [], [
+					AC_MSG_ERROR([Unable to find $f in the system. Consider
+								 specifying the path to the replacement library])
+				])
+			 done
+		fi
+])