diff --git a/CMakeLists.txt b/CMakeLists.txt
index 410f059..a218222 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -152,6 +152,7 @@ check_function_exists(gettimeofday    LIBVNCSERVER_HAVE_GETTIMEOFDAY)
 check_function_exists(vfork           LIBVNCSERVER_HAVE_VFORK)
 check_function_exists(vprintf         LIBVNCSERVER_HAVE_VPRINTF)
 check_function_exists(mmap            LIBVNCSERVER_HAVE_MMAP)
+check_function_exists(fork            LIBVNCSERVER_HAVE_FORK)
 
 
 # On systems such as GNU/Linux with glibc, __b64_ntop is defined in a
diff --git a/rfb/rfbconfig.h.cmake b/rfb/rfbconfig.h.cmake
index 58c9205..f2c96ee 100644
--- a/rfb/rfbconfig.h.cmake
+++ b/rfb/rfbconfig.h.cmake
@@ -75,6 +75,9 @@
 /* Define to 1 if `mmap' exists. */
 #cmakedefine LIBVNCSERVER_HAVE_MMAP  1 
 
+/* Define to 1 if `fork' exists. */
+#cmakedefine LIBVNCSERVER_HAVE_FORK  1 
+
 /* Define to 1 if you have the <ws2tcpip.h> header file. */
 #cmakedefine LIBVNCSERVER_HAVE_WS2TCPIP_H  1