ddb88250e4
```
imake-aarch64-unknown-linux-gnu> checking for cpp... no
imake-aarch64-unknown-linux-gnu> checking if aarch64-unknown-linux-gnu-gcc -E requires -undef... aarch64-unknown-linux-gnu-gcc: fatal error: noinput files
imake-aarch64-unknown-linux-gnu> compilation terminated.
imake-aarch64-unknown-linux-gnu> aarch64-unknown-linux-gnu-gcc: fatal error: no input files
imake-aarch64-unknown-linux-gnu> compilation terminated.
imake-aarch64-unknown-linux-gnu> aarch64-unknown-linux-gnu-gcc: fatal error: no input files
imake-aarch64-unknown-linux-gnu> compilation terminated.
imake-aarch64-unknown-linux-gnu> configure: error: aarch64-unknown-linux-gnu-gcc -E defines unix with or without -undef. I don't know what to do.
```
it appears that the configure script isn't checking
`${ac_tool_prefix}cpp`
```
for ac_prog in cpp
do
# Extract the first word of "$ac_prog", so it can be a program name with args.
set dummy $ac_prog; ac_word=$2
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
$as_echo_n "checking for $ac_word... " >&6; }
if ${ac_cv_path_RAWCPP+:} false; then :
```
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| .. | ||
| quartz-wm | ||
| xorg | ||
| xquartz | ||