diff --git a/CMakeLists.txt b/CMakeLists.txt
index ccab33d..c826f59 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,6 +23,7 @@
 set(EXTINCLUDEDIR "${EXTINSTALLDIR}/include")
 set(EXTCPPFLAGS "CFLAGS=-I${EXTINCLUDEDIR}")
 set(EXTLDFLAGS "LDFLAGS=-L${EXTLIBDIR}")
+set(EXTCC "CC=${CMAKE_C_COMPILER}" "CXX=${CMAKE_CXX_COMPILER}")
 
 set(gollvm_binroot "${CMAKE_CURRENT_BINARY_DIR}")
 
@@ -32,7 +33,7 @@
   DOWNLOAD_DIR ${CMAKE_CURRENT_BINARY_DIR}/external-downloads
   BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/external/gmp-build
   SOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR}/external/gmp
-  CONFIGURE_COMMAND <SOURCE_DIR>/configure --prefix=${EXTINSTALLDIR} ${EXTCPPFLAGS} ${EXTLDFLAGS}
+  CONFIGURE_COMMAND <SOURCE_DIR>/configure --prefix=${EXTINSTALLDIR} ${EXTCPPFLAGS} ${EXTLDFLAGS} ${EXTCC}
   BUILD_COMMAND make -j${PROCESSOR_COUNT} install
   LOG_CONFIGURE 1
   LOG_BUILD 1
@@ -46,7 +47,7 @@
   DOWNLOAD_DIR ${CMAKE_CURRENT_BINARY_DIR}/external-downloads
   BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/external/mpfr
   SOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR}/external/mpfr
-  CONFIGURE_COMMAND <SOURCE_DIR>/configure --with-gmp=${CMAKE_CURRENT_BINARY_DIR}/external/gmp --prefix=${EXTINSTALLDIR} ${EXTCPPFLAGS} ${EXTLDFLAGS}
+  CONFIGURE_COMMAND <SOURCE_DIR>/configure --with-gmp=${CMAKE_CURRENT_BINARY_DIR}/external/gmp --prefix=${EXTINSTALLDIR} ${EXTCPPFLAGS} ${EXTLDFLAGS} ${EXTCC}
   BUILD_COMMAND make -j${PROCESSOR_COUNT} install
   LOG_CONFIGURE 1
   LOG_BUILD 1
@@ -61,7 +62,7 @@
   BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/external/mpc
   SOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR}/external/mpc
   PREFIX ${EXTINSTALLDIR}
-  CONFIGURE_COMMAND <SOURCE_DIR>/configure --with-gmp=${CMAKE_CURRENT_BINARY_DIR}/external/gmp --with-mpfr=${CMAKE_CURRENT_BINARY_DIR}/external/mpfr --prefix=${EXTINSTALLDIR} ${EXTCPPFLAGS} ${EXTLDFLAGS}
+  CONFIGURE_COMMAND <SOURCE_DIR>/configure --with-gmp=${CMAKE_CURRENT_BINARY_DIR}/external/gmp --with-mpfr=${CMAKE_CURRENT_BINARY_DIR}/external/mpfr --prefix=${EXTINSTALLDIR} ${EXTCPPFLAGS} ${EXTLDFLAGS} ${EXTCC}
   BUILD_COMMAND make -j${PROCESSOR_COUNT} install
   LOG_CONFIGURE 1
   LOG_BUILD 1