diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5493401..a630bba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -87,6 +87,26 @@ else()
     "OwlPS Listener can be built only for Linux systems")
 endif()
 
-add_subdirectory(owlps-positioner)
+# OwlPS Positioner can be built only with GCC, and with a minimal
+# version. CMAKE_CXX_COMPILER_VERSION is not guaranteed to be set,
+# so we will test GCC's version number only if possible.
+set(POSITIONER_MIN_GCC_VERSION 4.7)
+if (CMAKE_COMPILER_IS_GNUCXX)
+  # Test the compiler version if we can
+  if (${CMAKE_CXX_COMPILER_VERSION})
+    if (${CMAKE_CXX_COMPILER_VERSION} VERSION_EQUAL ${POSITIONER_MIN_GCC_VERSION} OR
+        ${CMAKE_CXX_COMPILER_VERSION} VERSION_GREATER ${POSITIONER_MIN_GCC_VERSION})
+      add_subdirectory(owlps-positioner)
+    else() # GCC's version is too low
+      message(WARNING
+        "OwlPS Positioner requires GCC >= ${POSITIONER_MIN_GCC_VERSION}")
+    endif()
+  else() # we couldn't get GCC's version, let's try to build anyway
+    add_subdirectory(owlps-positioner)
+  endif()
+else() # we're not using GCC
+  message(WARNING
+    "OwlPS Positioner requires GCC (>= ${POSITIONER_MIN_GCC_VERSION})")
+endif()
 
 add_subdirectory(owlps-udp-to-http)