diff --git a/CMakeLists.txt b/CMakeLists.txt
index ac2a07cb..b787d40b 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -71,6 +71,7 @@ set(CMAKE_REQUIRED_LIBRARIES pthread rt)
 check_function_exists(pthread_setname_np HAVE_PTHREAD_SETNAME_NP)
 check_function_exists(pselect HAVE_PSELECT)
 check_function_exists(ppoll HAVE_PPOLL)
+check_function_exists(timegm HAVE_TIMEGM)
 check_include_file(linux/serial.h HAVE_LINUX_SERIAL -DHAVE_LINUX_SERIAL=1)
 check_include_file(dev/usb/uftdiio.h HAVE_FREEBSD_UFTDI -DHAVE_FREEBSD_UFTDI=1)
 
diff --git a/config.h.cmake b/config.h.cmake
index cdcadefe..83e80bd2 100755
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -37,6 +37,9 @@
 /* Defined if time.h is available. */
 #cmakedefine HAVE_TIME_H
 
+/* Defined if timegm() is available. */
+#cmakedefine HAVE_TIMEGM
+
 /* Defined if syslog.h is available. */
 #cmakedefine HAVE_SYSLOG_H
 
diff --git a/configure.ac b/configure.ac
index df0602af..999f6ba9 100755
--- a/configure.ac
+++ b/configure.ac
@@ -27,6 +27,7 @@ AC_CHECK_HEADERS([arpa/inet.h \
 	time.h \
 	termios.h])
 
+AC_CHECK_FUNC([timegm], [AC_DEFINE(HAVE_TIMEGM, [1], [Defined if timegm() is available.])])
 AC_CHECK_FUNC([cfsetspeed], [AC_DEFINE(HAVE_CFSETSPEED, [1], [Defined if cfsetspeed() is available.])])
 
 AC_CHECK_LIB([pthread], [pthread_setname_np],
diff --git a/src/lib/utils/httpclient.cpp b/src/lib/utils/httpclient.cpp
index 50440491..65639514 100755
--- a/src/lib/utils/httpclient.cpp
+++ b/src/lib/utils/httpclient.cpp
@@ -506,7 +506,7 @@ bool* repeatable, time_t* time) {
   string headers = result.substr(0, pos+2);  // including final \r\n
   const char* hdrs = headers.c_str();
   *response = result.substr(pos+4);
-#ifdef HAVE_TIME_H
+#if defined(HAVE_TIME_H) && defined(HAVE_TIMEGM)
   if (time) {
     pos = headers.find("\r\nLast-Modified: ");
     if (pos != string::npos && headers.substr(pos+42, 4) == " GMT") {