Merge pull request #950 from hallard/patch-1

fix M1 homebrew path

build.sh

@@ -49,9 +49,15 @@ case "${ostype}" in
 	if [ -f /opt/local/bin/port ]
 	then
 	    build_flags="${build_flags} -D CMAKE_C_FLAGS=-I/opt/local/include -D CMAKE_EXE_LINKER_FLAGS=-L/opt/local/lib"
+	else
+            # Apple M1 (may be new version of homebrew also)
+            if [ -d /opt/homebrew ]  
+            then
+                build_flags="${build_flags} -D CMAKE_C_FLAGS=-I/opt/homebrew/include -D CMAKE_EXE_LINKER_FLAGS=-L/opt/homebrew/Cellar"
             else
                 build_flags="${build_flags} -D CMAKE_C_FLAGS=-I/usr/local/include -D CMAKE_EXE_LINKER_FLAGS=-L/usr/local/Cellar"
             fi
+	fi
 	;;
 
     freebsd)