fix the patch macOS Intel GMP

Signed-off-by: Panagiotis Georgiadis <pgeorgia@redhat.com>

Author: drpaneas

.github/workflows/build.yml

@@ -71,7 +71,7 @@ jobs:
       run: |
         git config --global user.email "builds@travis-ci.com"
         git config --global user.name "Travis CI"
-        brew install automake texinfo
+        brew install autoconf automake libtool texinfo
         mkdir -p build
         cd build
         cmake ..

CMakeLists.txt

@@ -216,18 +216,18 @@ function(toolchain_deps toolchain_deps_dir toolchain_install_dir toolchain_suffi
     # GMP assembly causes issues on macOS - need to disable it and use PIC
     if(${CMAKE_SYSTEM_NAME} STREQUAL "Darwin")
         set(gmp_asm_flag --disable-assembly)
-        set(gmp_pic_flags "CFLAGS=-fPIC -fexceptions" "CXXFLAGS=-fPIC")
+        set(gmp_env_command ${CMAKE_COMMAND} -E env "CFLAGS=-fPIC -fexceptions" "CXXFLAGS=-fPIC")
     else()
         set(gmp_asm_flag "")
-        set(gmp_pic_flags "CPPFLAGS=-fexceptions")
+        set(gmp_env_command ${CMAKE_COMMAND} -E env "CPPFLAGS=-fexceptions")
     endif()
 
     ExternalProject_add(gmp${suffix}
         URL https://ftpmirror.gnu.org/gnu/gmp/gmp-${GMP_VERSION}.tar.bz2
         URL_HASH ${GMP_HASH}
         DOWNLOAD_DIR ${DOWNLOAD_DIR}
         PATCH_COMMAND sh ${PROJECT_SOURCE_DIR}/cmake/update_config_files.sh <SOURCE_DIR>
-        CONFIGURE_COMMAND ${gmp_pic_flags} ${compiler_flags} ${wrapper_command} <SOURCE_DIR>/configure
+        CONFIGURE_COMMAND ${gmp_env_command} ${compiler_flags} ${wrapper_command} <SOURCE_DIR>/configure
         --build=${build_native}
         --host=${toolchain_host}
         --prefix=${toolchain_deps_dir}