diff --git a/src/Leanc.lean b/src/Leanc.lean
index ac4753942f..86609af40d 100644
--- a/src/Leanc.lean
+++ b/src/Leanc.lean
@@ -23,7 +23,7 @@ Beware of the licensing consequences since GMP is LGPL."
   let cflags := ["-I", (root / "include").toString] ++ "@LEANC_EXTRA_FLAGS@".trim.splitOn
   let mut cflagsInternal := "@LEANC_INTERNAL_FLAGS@".trim.splitOn
   let mut ldflagsInternal := "@LEANC_INTERNAL_LINKER_FLAGS@".trim.splitOn
-  let mut ldflags := ["-L", (root / "lib" / "lean").toString, "-lgmp"] ++ "@LEAN_EXTRA_LINKER_FLAGS@".trim.splitOn
+  let mut ldflags := ["-L", (root / "lib" / "lean").toString, (← IO.getEnv "LEANC_GMP").getD "-lgmp"] ++ "@LEAN_EXTRA_LINKER_FLAGS@".trim.splitOn
   let mut ldflagsExt := "@LEANC_STATIC_LINKER_FLAGS@".trim.splitOn
 
   for arg in args do
diff --git a/src/shell/CMakeLists.txt b/src/shell/CMakeLists.txt
index 85f33616e8..ffcb0a178c 100644
--- a/src/shell/CMakeLists.txt
+++ b/src/shell/CMakeLists.txt
@@ -81,7 +81,8 @@ ENDFOREACH(T)
 
 add_test(NAME leancomptest_foreign
          WORKING_DIRECTORY "${LEAN_SOURCE_DIR}/../tests/compiler/foreign"
-         COMMAND bash -c "${LEAN_BIN}/leanmake --always-make CXX='${CMAKE_CXX_COMPILER} ${LEANC_OPTS}'")
+         # LEANC_OPTS is necessary for macOS c++ to find its headers, GMP will be removed soon
+         COMMAND bash -c "LEANC_GMP=${GMP_LIBRARIES} ${LEAN_BIN}/leanmake --always-make CXX='${CMAKE_CXX_COMPILER} ${LEANC_OPTS}'")
 add_test(NAME leancomptest_doc_example
          WORKING_DIRECTORY "${LEAN_SOURCE_DIR}/../doc/examples/compiler"
          COMMAND bash -c "export ${TEST_VARS}; leanmake --always-make bin && ./build/bin/test hello world")