--- old/make/autoconf/toolchain.m4	2020-06-04 23:38:59.396560643 -0400
+++ new/make/autoconf/toolchain.m4	2020-06-04 23:38:58.976546385 -0400
@@ -50,9 +50,9 @@
 TOOLCHAIN_DESCRIPTION_xlc="IBM XL C/C++"
 
 # Minimum supported versions, empty means unspecified
-TOOLCHAIN_MINIMUM_VERSION_clang="3.2"
+TOOLCHAIN_MINIMUM_VERSION_clang="3.5"
 TOOLCHAIN_MINIMUM_VERSION_gcc="5.0"
-TOOLCHAIN_MINIMUM_VERSION_microsoft="16.00.30319.01" # VS2010
+TOOLCHAIN_MINIMUM_VERSION_microsoft="19.10.0.0" # VS2017
 TOOLCHAIN_MINIMUM_VERSION_xlc=""
 
 # Minimum supported linker versions, empty means unspecified