diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 7b6c174..77a1465 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -8,8 +8,6 @@ if ( BSD )
   add_definitions( -DSYS_ENDIAN_H )
 endif ( BSD )
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Ofast -march=native -DSTANDALONE -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS -DTARGET_POSIX -D_LINUX -fPIC -DPIC -D_REENTRANT -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -U_FORTIFY_SOURCE -Wall -g")
-
 if( APPLE )
   set( ENV{PKG_CONFIG_PATH} "/usr/local/lib/pkgconfig" ) # standard location, and Brew
   set( ENV{PKG_CONFIG_PATH} "$ENV{PKG_CONFIG_PATH}:/opt/local/lib/pkgconfig/" ) # MacPorts
diff --git a/renderers/CMakeLists.txt b/renderers/CMakeLists.txt
index 00b80b7..450840b 100644
--- a/renderers/CMakeLists.txt
+++ b/renderers/CMakeLists.txt
@@ -1,6 +1,14 @@
 cmake_minimum_required(VERSION 3.4.1)
-  
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Ofast -march=native -DSTANDALONE -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS -DTARGET_POSIX -D_LINUX -fPIC -DPIC -D_REENTRANT -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -U_FORTIFY_SOURCE -Wall -g")
+
+# Common Linux cflags
+if ( UNIX AND NOT APPLE )
+  set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DSTANDALONE -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS -DTARGET_POSIX -D_LINUX -fPIC -DPIC -D_REENTRANT -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -U_FORTIFY_SOURCE -Wall -g" )
+endif()
+
+# Common x86/x86_64 cflags
+if( CMAKE_SYSTEM_PROCESSOR MATCHES "(x86)|(X86)|(amd64)|(AMD64)" )
+    set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Ofast -march=native" )
+endif()
 
 if (APPLE )
   set( ENV{PKG_CONFIG_PATH} "/Library/FrameWorks/GStreamer.framework/Libraries/pkgconfig" ) # GStreamer.framework, preferred