--- a/Telegram/gyp/PrecompiledHeader.cmake
+++ b/Telegram/gyp/PrecompiledHeader.cmake
@@ -79,7 +79,6 @@ function(export_all_flags _filename _source_name_for_flags)
 endfunction()
 
 function(add_precompiled_header _target _input)
-  if(CMAKE_COMPILER_IS_GNUCXX)
     get_filename_component(_name ${_input} NAME)
     set(_pch_header "${CMAKE_CURRENT_SOURCE_DIR}/${_input}")
     set(_pch_binary_dir "${CMAKE_CURRENT_BINARY_DIR}/${_target}_pch")
@@ -112,7 +111,7 @@ function(add_precompiled_header _target _input)
       set(_compiler_FLAGS "@${_pch_c_flags_file}")
       add_custom_command(
         OUTPUT "${_output_c}"
-        COMMAND "${CMAKE_C_COMPILER}" ${_compiler_FLAGS} -x c-header -o "${_output_c}" -c "${_pchfile}"
+        COMMAND "${CMAKE_C_COMPILER}" ${_compiler_FLAGS} "$(C_FLAGS)" -x c-header -o "${_output_c}" -c "${_pchfile}"
         DEPENDS "${_pchfile}" "${_pch_c_flags_file}"
         IMPLICIT_DEPENDS C "${_pch_header}"
         COMMENT "Precompiling ${_name} for ${_target} (C)")
@@ -123,7 +122,7 @@ function(add_precompiled_header _target _input)
       set(_compiler_FLAGS "@${_pch_cpp_flags_file}")
       add_custom_command(
         OUTPUT "${_output_cxx}"
-        COMMAND "${CMAKE_CXX_COMPILER}" ${_compiler_FLAGS} -x c++-header -o "${_output_cxx}" -c "${_pchfile}"
+        COMMAND "${CMAKE_CXX_COMPILER}" ${_compiler_FLAGS} "$(CXX_FLAGS)" -x c++-header -o "${_output_cxx}" -c "${_pchfile}"
         DEPENDS "${_pchfile}" "${_pch_cpp_flags_file}"
         IMPLICIT_DEPENDS CXX "${_pch_header}"
         COMMENT "Precompiling ${_name} for ${_target} (C++)")
@@ -161,5 +160,4 @@ function(add_precompiled_header _target _input)
           OBJECT_DEPENDS "${_object_depends}")
       endif()
     endforeach()
-  endif(CMAKE_COMPILER_IS_GNUCXX)
 endfunction()