diff --git a/src/native/common/org_lwjgl_opengl_GL.cpp b/src/native/common/org_lwjgl_opengl_GL.cpp
index 3c7a8b4b..718efd54 100644
--- a/src/native/common/org_lwjgl_opengl_GL.cpp
+++ b/src/native/common/org_lwjgl_opengl_GL.cpp
@@ -4660,17 +4660,17 @@ JNIEXPORT void JNICALL Java_org_lwjgl_opengl_GL_writeMaskEXT(JNIEnv * env, jobje
  */
 JNIEXPORT void JNICALL Java_org_lwjgl_opengl_GL_checkWGLExtensionsString(JNIEnv * env, jclass clazz)
 {
-
-#ifdef _WIN32
 	jfieldID fid_WGL_ARB_extensions_string = env->GetStaticFieldID(clazz, "WGL_ARB_extensions_string", "Z");
 	jfieldID fid_WGL_EXT_extensions_string = env->GetStaticFieldID(clazz, "WGL_EXT_extensions_string", "Z");
+#ifdef _WIN32
 
 	if (wglGetExtensionsStringARB)
 		env->SetStaticBooleanField(clazz, fid_WGL_ARB_extensions_string, JNI_TRUE);
 	if (wglGetExtensionsStringEXT)
 		env->SetStaticBooleanField(clazz, fid_WGL_EXT_extensions_string, JNI_TRUE);
 #else
-	CHECK_EXISTS(NULL)
+	env->SetStaticBooleanField(clazz, fid_WGL_ARB_extensions_string, JNI_FALSE);
+	env->SetStaticBooleanField(clazz, fid_WGL_EXT_extensions_string, JNI_FALSE);
 #endif
 }
 
diff --git a/src/native/configure.in b/src/native/configure.in
index acfebc3a..4288c7a1 100644
--- a/src/native/configure.in
+++ b/src/native/configure.in
@@ -51,8 +51,8 @@ if test "x$JAVA_HOME" = x; then
 else
   AC_MSG_RESULT($JAVA_HOME)
   JAVA_HOME="$JAVA_HOME"
-  CPPFLAGS="$CPPFLAGS -D_X11 -I$JAVA_HOME/include -I$JAVA_HOME/include/linux"
-  CFLAGS="$CFLAGS -D_X11 -I$JAVA_HOME/include -I$JAVA_HOME/include/linux"
+  CPPFLAGS="$CPPFLAGS -D_DEBUG -D_X11 -I$JAVA_HOME/include -I$JAVA_HOME/include/linux"
+  CFLAGS="$CFLAGS -D_DEBUG -D_X11 -I$JAVA_HOME/include -I$JAVA_HOME/include/linux"
 fi
 
 dnl Checks for libraries.