diff --git a/platform/osx/detect.py b/platform/osx/detect.py
index e8a83194310..5b04ab8826e 100644
--- a/platform/osx/detect.py
+++ b/platform/osx/detect.py
@@ -82,7 +82,7 @@ def configure(env):
             env['RANLIB'] = mpprefix + "/libexec/llvm-" + mpclangver + "/bin/llvm-ranlib"
             env['AS'] = mpprefix + "/libexec/llvm-" + mpclangver + "/bin/llvm-as"
             env.Append(CCFLAGS=['-D__MACPORTS__']) #hack to fix libvpx MM256_BROADCASTSI128_SI256 define
-            if (env["openmp"]):
+            if env['tools'] and env['openmp']:
                 env.Append(CPPFLAGS=['-fopenmp'])
                 env.Append(LINKFLAGS=['-fopenmp'])
 
diff --git a/platform/windows/detect.py b/platform/windows/detect.py
index 564359d743d..e216868bd85 100644
--- a/platform/windows/detect.py
+++ b/platform/windows/detect.py
@@ -191,7 +191,7 @@ def configure(env):
         if (env["use_lto"]):
             env.Append(CCFLAGS=['/GL'])
             env.Append(LINKFLAGS=['/LTCG'])
-        if (env["openmp"]):
+        if env['tools'] and env['openmp']:
             env.Append(CPPFLAGS=['/openmp'])
 
         env.Append(CCFLAGS=["/I" + p for p in os.getenv("INCLUDE").split(";")])
@@ -270,7 +270,7 @@ def configure(env):
             env.Append(CCFLAGS=['-flto'])
             env.Append(LINKFLAGS=['-flto=' + str(env.GetOption("num_jobs"))])
 
-        if (env["openmp"]):
+        if env['tools'] and env['openmp']:
             env.Append(CPPFLAGS=['-fopenmp'])
             env.Append(LINKFLAGS=['-fopenmp'])
 
diff --git a/platform/x11/detect.py b/platform/x11/detect.py
index 09bf57c5f17..98ae9a86585 100644
--- a/platform/x11/detect.py
+++ b/platform/x11/detect.py
@@ -265,7 +265,7 @@ def configure(env):
         env.Append(LINKFLAGS=['-m64', '-L/usr/lib/i686-linux-gnu'])
 
 
-    if env["openmp"]:
+    if env['tools'] and env['openmp']:
         env.Append(CPPFLAGS=['-fopenmp'])
         env.Append(LINKFLAGS=['-fopenmp'])