GCC 9 no longer accepts this flag and trying to find out what it does do
leads to an article

"-no-cpp-precomp: the compiler flag that time forgot"

that also no longer on the Internet. And most other things are
PRs/commits from over ten years ago that remove the flag since it
is no longer needed.
 configure.ac | 2 --
 1 file changed, 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 2cc396e5..e9f8a2f9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -323,8 +323,6 @@ case "$host" in
                AC_DEFINE([TARGET_DARWIN], [1], [Are we running on Mac OS X?])
                AC_DEFINE_UNQUOTED([TARGET_PREFIX], ["M"], [Target prefix])
-               dnl some Mac OS X tendering (we use vararg macros...)
-               CPPFLAGS="$CPPFLAGS -no-cpp-precomp"

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