diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 5994132..c61d4b1 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -2,11 +2,6 @@
 # Copyright 2013,2016,2018 Alexander Dahl <post@lespocky.de>
 #
 
-configure_file(
-	"${CMAKE_CURRENT_SOURCE_DIR}/config.h.cmake.in"
-	"${CMAKE_CURRENT_BINARY_DIR}/config.h"
-)
-
 set(CGI_SRC
 	base64.c
 	cgi.c
@@ -14,7 +9,7 @@ set(CGI_SRC
 	error.c
 	general.c
 	list.c
-	#	md5.c
+	md5.c
 	session.c
 	string.c
 )
diff --git a/src/cgi.h b/src/cgi.h
index 4874a68..f9daccb 100644
--- a/src/cgi.h
+++ b/src/cgi.h
@@ -23,6 +23,17 @@
 
 #include <stdio.h>
 
+#if defined(__GNUC__)
+#define CGI_DEPRECATED __attribute__ ((deprecated))
+#elif defined(_MSC_VER)
+#define CGI_DEPRECATED __declspec(deprecated)
+#elif defined(__clang__)
+#define CGI_DEPRECATED __deprecated
+#else
+#pragma message("WARNING: You need to implement CGI_DEPRECATED for this compiler")
+#define CGI_DEPRECATED
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -81,7 +92,7 @@ extern char *stripslashes(char *str);
 extern char *str_base64_encode(char *str);
 extern char *str_base64_decode(char *str);
 extern char *recvline(FILE *fp);
-extern char *md5(const char *str);
+CGI_DEPRECATED extern char *md5(const char *str);
 extern char *cgi_ltrim(char *str);
 extern char *cgi_rtrim(char *str);
 extern char *cgi_trim(char *str);
diff --git a/src/config.h.cmake.in b/src/config.h.cmake.in
deleted file mode 100644
index 29271cf..0000000
--- a/src/config.h.cmake.in
+++ /dev/null
@@ -1 +0,0 @@
-#define	HAVE_MD5	0
diff --git a/src/md5.c b/src/md5.c
index 56cf5c0..a004e15 100644
--- a/src/md5.c
+++ b/src/md5.c
@@ -23,7 +23,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "config.h"
 #include "error.h"
 #include "cgi.h"
 
@@ -31,8 +30,6 @@
 * @{
 */
 
-#if HAVE_MD5
-
 #ifndef MD5_H
 #define MD5_H
 
@@ -95,7 +92,6 @@ char *md5(const char *str)
 	// returning a encrypted string
 	return tmp;
 }
-#endif
 
 /*=======================================================================*/