From 72ecdb8a808caeac7c676efac845d815f16dd923 Mon Sep 17 00:00:00 2001
From: nullifiedcat <nullifiedcat@catbox>
Date: Sat, 9 Dec 2017 17:10:53 +0300
Subject: [PATCH] add a check for extension

---
 .settings/language.settings.xml | 4 ++--
 src/drawglx.c                   | 3 ++-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/.settings/language.settings.xml b/.settings/language.settings.xml
index 3988f40..8f56505 100644
--- a/.settings/language.settings.xml
+++ b/.settings/language.settings.xml
@@ -4,8 +4,8 @@
 		<extension point="org.eclipse.cdt.core.LanguageSettingsProvider">
 			<provider copy-of="extension" id="org.eclipse.cdt.ui.UserLanguageSettingsProvider"/>
 			<provider-reference id="org.eclipse.cdt.core.ReferencedProjectsLanguageSettingsProvider" ref="shared-provider"/>
-			<provider class="org.eclipse.cdt.managedbuilder.language.settings.providers.GCCBuildCommandParser" id="org.eclipse.cdt.managedbuilder.core.GCCBuildCommandParser" keep-relative-paths="false" name="CDT GCC Build Output Parser" parameter="(g?cc)|([gc]\+\+)|(clang)" prefer-non-shared="true"/>
-			<provider class="org.eclipse.cdt.managedbuilder.language.settings.providers.GCCBuiltinSpecsDetector" console="false" env-hash="1458929643180439737" id="org.eclipse.cdt.managedbuilder.core.GCCBuiltinSpecsDetector" keep-relative-paths="false" name="CDT GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
+			<provider copy-of="extension" id="org.eclipse.cdt.managedbuilder.core.GCCBuildCommandParser"/>
+			<provider class="org.eclipse.cdt.managedbuilder.language.settings.providers.GCCBuiltinSpecsDetector" console="false" env-hash="1524655754455266653" id="org.eclipse.cdt.managedbuilder.core.GCCBuiltinSpecsDetector" keep-relative-paths="false" name="CDT GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
 				<language-scope id="org.eclipse.cdt.core.gcc"/>
 				<language-scope id="org.eclipse.cdt.core.g++"/>
 			</provider>
diff --git a/src/drawglx.c b/src/drawglx.c
index af65b60..20f9c49 100644
--- a/src/drawglx.c
+++ b/src/drawglx.c
@@ -206,7 +206,8 @@ int xoverlay_glx_create_window()
     PFNGLXSWAPINTERVALEXTPROC glXSwapIntervalEXT =
         (PFNGLXSWAPINTERVALEXTPROC) glXGetProcAddressARB(
             (const GLubyte *) "glXSwapIntervalEXT");
-    glXSwapIntervalEXT(xoverlay_library.display, xoverlay_library.window, 0);
+    if (glXSwapIntervalEXT)
+    	glXSwapIntervalEXT(xoverlay_library.display, xoverlay_library.window, 0);
     glXSwapBuffers(xoverlay_library.display, xoverlay_library.window);
 
     return 0;