Simon Wells <swel...@gmail.com> added the comment:

oh the rabbit hole...

as i have other builds of python3.7 on my system i wanted to ensure it used the 
correct python and python-config (python 3.7 was built and installed into 
$HOME/Projects/python/inst/) as such its a rather convoluted configure command 
for libxml2

LDFLAGS="-L$HOME/Projects/python/inst/lib" 
PATH=/Users/simon/Projects/python/inst/bin/:$PATH ./configure 
--prefix=/Users/simon/Projects/python/inst/ 
--with-python=/Users/simon/Projects/python/inst/bin/python3 
--with-python-install-dir=/Users/simon/Projects/python/inst/lib/python3.7/site-packages

the LDFLAGS envvar was required as python-config --ldflags also does not 
provide -L for the python libary

$make
ld: library not found for -lpython3.7m

in config.log for libxml2 (PYTHON_LIBS which is the output of 
$HOME/Projects/python/python3-config --ldflags)
PYTHON_LIBS='-lpython3.7m -ldl -framework CoreFoundation 
-Wl,-stack_size,1000000 -framework CoreFoundation'


after LDFLAGS="..." is added

$make
...
  CCLD     libxml2mod.la
ld: -stack_size option can only be used when linking a main executable
clang: error: linker command failed with exit code 1 (use -v to see invocation)

if you want more log lines please let me know but those should be the only 
relevant ones

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34960>
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