diff --git a/.cproject b/.cproject
index 51c77f8e9..8a879f8a7 100644
--- a/.cproject
+++ b/.cproject
@@ -22,7 +22,7 @@
 					<folderInfo id="0.2079208171." name="/" resourcePath="">
 						<toolChain id="org.eclipse.cdt.build.core.prefbase.toolchain.2084203071" name="No ToolChain" resourceTypeBasedDiscovery="false" superClass="org.eclipse.cdt.build.core.prefbase.toolchain">
 							<targetPlatform binaryParser="org.eclipse.cdt.core.MachO64;org.eclipse.cdt.core.ELF" id="org.eclipse.cdt.build.core.prefbase.toolchain.2084203071.81924294" name=""/>
-							<builder arguments="-j4 CFLAGS=&quot;-g -Wall&quot; CXXFLAGS=&quot;-g&quot;" command="make" id="org.eclipse.cdt.build.core.settings.default.builder.731584538" keepEnvironmentInBuildfile="false" managedBuildOn="false" name="Gnu Make Builder" superClass="org.eclipse.cdt.build.core.settings.default.builder"/>
+							<builder arguments="-j4 CFLAGS=&quot;-g -Wall -Qunused-arguments&quot; CXXFLAGS=&quot;-g&quot;" command="make" id="org.eclipse.cdt.build.core.settings.default.builder.731584538" keepEnvironmentInBuildfile="false" managedBuildOn="false" name="Gnu Make Builder" superClass="org.eclipse.cdt.build.core.settings.default.builder"/>
 							<tool id="org.eclipse.cdt.build.core.settings.holder.libs.1252970003" name="holder for library settings" superClass="org.eclipse.cdt.build.core.settings.holder.libs"/>
 							<tool id="org.eclipse.cdt.build.core.settings.holder.1371414073" name="GNU C++" superClass="org.eclipse.cdt.build.core.settings.holder">
 								<inputType id="org.eclipse.cdt.build.core.settings.holder.inType.306286573" languageId="org.eclipse.cdt.core.g++" languageName="GNU C++" sourceContentType="org.eclipse.cdt.core.cxxSource,org.eclipse.cdt.core.cxxHeader" superClass="org.eclipse.cdt.build.core.settings.holder.inType"/>
@@ -35,6 +35,7 @@
 							</tool>
 						</toolChain>
 					</folderInfo>
+					<fileInfo id="0.2079208171.2090246372" name="ringback.wav" rcbsApplicability="disable" resourcePath="tester/sounds/ringback.wav" toolsToInvoke=""/>
 					<sourceEntries>
 						<entry flags="VALUE_WORKSPACE_PATH" kind="sourcePath" name="coreapi"/>
 						<entry flags="VALUE_WORKSPACE_PATH" kind="sourcePath" name="gtk"/>
diff --git a/configure.ac b/configure.ac
index d48a32dc5..5c6700d5f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -36,12 +36,12 @@ m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])],)
 AC_SUBST([docdir], [${datadir}/doc])
 AC_CONFIG_HEADERS(config.h)
 AC_CONFIG_MACRO_DIR([m4])
-
-gl_LD_OUTPUT_DEF
-
+dnl don't put anythingelse before AC_PROG_CC unless checking if macro still work for clang
 AC_PROG_CXX(["xcrun clang++" g++])
 AC_PROG_CC(["xcrun clang" gcc])
 
+gl_LD_OUTPUT_DEF
+
 AC_ISC_POSIX
 AC_C_INLINE
 AC_HEADER_STDC
@@ -67,7 +67,7 @@ case $target in
 		AC_CHECK_TOOL(WINDRES, windres)
 	;;
 	armv6-apple-darwin|armv7-apple-darwin|i386-apple-darwin|armv7s-apple-darwin)
-		CFLAGS="$CFLAGS -DTARGET_OS_IPHONE "
+		CFLAGS="$CFLAGS -DTARGET_OS_IPHONE=1 "
 		ios_found=yes
 	;;
 	x86_64-apple-darwin*|i686-apple-darwin*)
diff --git a/mediastreamer2 b/mediastreamer2
index d90b00711..69a7cce94 160000
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit d90b00711f794814fe670c846ca162704df883c7
+Subproject commit 69a7cce94756f9e5af3fae9fbd941817c4731f49