Fix build on older versions of mac

    Building on Homebrew it builds on multiple older versions of mac.
    Some older versions don't support to_char() for double.

config.h.in

@@ -54,6 +54,9 @@
 /* We have found package ZLIB */
 #undef HAVE_ZLIB
 
+/* Check for older build tools and use simpler code with old tools */
+#undef HOMEBREW_OLD_VERSION_OF_MAC
+
 /* Define to the sub-directory where libtool stores uninstalled libraries. */
 #undef LT_OBJDIR
 

configure

@@ -823,6 +823,7 @@ with_aix_soname
 with_gnu_ld
 with_sysroot
 enable_libtool_lock
+with_homebrewCLT
 enable_dependency_tracking
 enable_silent_rules
 '
@@ -1552,6 +1553,9 @@ Optional Packages:
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
   --with-sysroot[=DIR]    Search for dependent libraries within DIR (or the
                           compiler's sysroot if not specified).
+  --with-homebrewCLT=<CLT Version>
+                          Define what version of the CLT is being used
+
 
 Some influential environment variables:
   CXX         C++ compiler command
@@ -18239,6 +18243,30 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
 
 
+
+# Check whether --with-homebrewCLT was given.
+if test ${with_homebrewCLT+y}
+then :
+  withval=$with_homebrewCLT;
+fi
+
+if test "x${with_homebrewCLT}" != "x"
+then :
+
+        if test ${with_homebrewCLT} -lt 153
+then :
+
+
+printf "%s\n" "#define HOMEBREW_OLD_VERSION_OF_MAC 1" >>confdefs.h
+
+                subconfigure="${subconfigure} --with-homebrewCLT=${with_homebrewCLT}"
+
+
+fi
+
+
+fi
+
 subconfigure="${subconfigure} --with-thorserialize-root=$(pwd)/build "
 
 

configure.ac

@@ -26,6 +26,25 @@ int main() {
 
 LT_INIT
 
+AC_ARG_WITH(
+    [homebrewCLT],
+    AS_HELP_STRING([--with-homebrewCLT=<CLT Version>], [Define what version of the CLT is being used])
+)
+AS_IF(
+    [test "x${with_homebrewCLT}" != "x"],
+    [
+        AC_MSG_NOTICE([Have with_homebrewCLT in Mongo => ${with_homebrewCLT}])
+        AS_IF(
+            [test ${with_homebrewCLT} -lt 153],
+            [
+                AC_MSG_NOTICE([Setting HOMEBREW_OLD_VERSION_OF_MAC])
+                AC_DEFINE([HOMEBREW_OLD_VERSION_OF_MAC], [1], [Check for older build tools and use simpler code with old tools])
+                subconfigure="${subconfigure} --with-homebrewCLT=${with_homebrewCLT}"
+            ]
+        )
+    ]
+)
+
 subconfigure="${subconfigure} --with-thorserialize-root=$(pwd)/build "
 
 AX_THOR_FEATURE_HEADER_ONLY_VARIANT([THORS_SERIALIZER])