diff --git a/deps/+GMP/GMP.cmake b/deps/+GMP/GMP.cmake
index 1cc59262ec..b0b76609f2 100644
--- a/deps/+GMP/GMP.cmake
+++ b/deps/+GMP/GMP.cmake
@@ -44,6 +44,7 @@ else ()
     endif ()
 
     ExternalProject_Add(dep_GMP
+        EXCLUDE_FROM_ALL ON
         URL https://gmplib.org/download/gmp/gmp-6.2.1.tar.bz2
         URL_HASH SHA256=eae9326beb4158c386e39a356818031bd28f3124cf915f8c5b1dc4c7a36b4d7c
         DOWNLOAD_DIR ${DEP_DOWNLOAD_DIR}/GMP
diff --git a/deps/+MPFR/MPFR.cmake b/deps/+MPFR/MPFR.cmake
index 18a2be7d8a..3975d7a87b 100644
--- a/deps/+MPFR/MPFR.cmake
+++ b/deps/+MPFR/MPFR.cmake
@@ -26,6 +26,7 @@ else ()
     endif ()
 
     ExternalProject_Add(dep_MPFR
+        EXCLUDE_FROM_ALL ON
         URL http://ftp.vim.org/ftp/gnu/mpfr/mpfr-3.1.6.tar.bz2 https://www.mpfr.org/mpfr-3.1.6/mpfr-3.1.6.tar.bz2  # mirrors are allowed
         URL_HASH SHA256=cf4f4b2d80abb79e820e78c8077b6725bbbb4e8f41896783c899087be0e94068
         DOWNLOAD_DIR ${DEP_DOWNLOAD_DIR}/MPFR