diff --git a/submodules/build/Makefile b/submodules/build/Makefile
index 82e8e5356..0f9a94cb0 100644
--- a/submodules/build/Makefile
+++ b/submodules/build/Makefile
@@ -119,10 +119,10 @@ arm64:
 	make -f builder-iphone-os.mk host=aarch64-apple-darwin $(LINPHONE_OPTIONS) V=1 VERBOSE=1
 
 x64:
-	make -f builder-iphone-os.mk host=x86_64-apple-darwin $(LINPHONE_OPTIONS)
+	make -f builder-iphone-os.mk host=x86_64-apple-darwin.ios $(LINPHONE_OPTIONS)
 
 x64-%:
-	make -f builder-iphone-os.mk host=x86_64-apple-darwin $(LINPHONE_OPTIONS) $* V=1 VERBOSE=1
+	make -f builder-iphone-os.mk host=x86_64-apple-darwin.ios $(LINPHONE_OPTIONS) $* V=1 VERBOSE=1
 
 
 # sends the target after 'broadcast_' to all sub-architectures (armv7, simu, arm64)
diff --git a/submodules/build/builders.d/libvpx.mk b/submodules/build/builders.d/libvpx.mk
index 98e398061..800844397 100644
--- a/submodules/build/builders.d/libvpx.mk
+++ b/submodules/build/builders.d/libvpx.mk
@@ -35,6 +35,9 @@ else ifneq (,$(findstring armv7,$(host)))
 else ifneq (,$(findstring aarch64,$(host)))
 	libvpx_configure_options+= --target=arm64-darwin-gcc
 	take_binary = arm64
+else ifneq (,$(findstring x86_64,$(host)))
+	libvpx_configure_options+= --target=x86_64-iphonesimulator-gcc
+	take_binary = x86_64
 else
 	libvpx_configure_options+= --target=x86-darwin10-gcc
 	take_binary = i386
diff --git a/submodules/build/builders.d/openh264.mk b/submodules/build/builders.d/openh264.mk
index 63210cdde..84cfd5e35 100644
--- a/submodules/build/builders.d/openh264.mk
+++ b/submodules/build/builders.d/openh264.mk
@@ -29,6 +29,13 @@ endif
 ifneq (,$(findstring aarch64-,$(host)))
 	ARCH=arm64
 endif
+ifneq (,$(findstring x86_64-,$(host)))
+	ARCH=x86_64
+endif
+
+ifeq (,$(ARCH))
+$(error Undefined arch for openh264)
+endif
 
 openh264_dir?=externals/openh264
 
diff --git a/submodules/build/iphone-config.site b/submodules/build/iphone-config.site
index a8d100f1b..88c3a2b97 100644
--- a/submodules/build/iphone-config.site
+++ b/submodules/build/iphone-config.site
@@ -19,7 +19,7 @@ elif test "${host_alias}" = "aarch64-apple-darwin" ; then
 	ARCH=arm64
 	PLATFORM=OS
 	CMAKE_OPTS="-DCMAKE_SYSTEM_PROCESSOR=aarch64"
-elif test "${host_alias}" = "x86_64-apple-darwin" ; then 
+elif test "${host_alias}" = "x86_64-apple-darwin.ios" ; then 
 	ARCH=x86_64
 	PLATFORM=Simulator
 	CMAKE_OPTS="-DCMAKE_SYSTEM_PROCESSOR=x86_64"