[Spot] Compilation under Cygwin

Hi, I'm attempting to compile under cygwin. Calling configure (with --disable-python) succeeds, but make fails (with error message as below). The problem would appear to be the absence of 'secure_getenv', though FWIW the generated makefile contains 'HAVE_SECURE_GETENV = 0'. Any pointers on how I might get this to compile (preferably with minimum disruption to the source or build process)? Thanks and best wishes, Jerry. =============================== Error message: /bin/sh ../../libtool --tag=CXX --mode=compile g++ -DHAVE_CONFIG_H -I. -I../.. -I../.. -I../.. -I../../buddy/src -I../../lib -I../../lib -DNDEBUG -fvisibility=hidden -fvisibility-inlines-hidden -DSPOT_BUILD -std=c++14 -g -O3 -ffast-math -fstrict-aliasing -fomit-frame-pointer -MT tmpfile.lo -MD -MP -MF .deps/tmpfile.Tpo -c -o tmpfile.lo tmpfile.cc libtool: compile: g++ -DHAVE_CONFIG_H -I. -I../.. -I../.. -I../.. -I../../buddy/src -I../../lib -I../../lib -DNDEBUG -fvisibility=hidden -fvisibility-inlines-hidden -DSPOT_BUILD -std=c++14 -g -O3 -ffast-math -fstrict-aliasing -fomit-frame-pointer -MT tmpfile.lo -MD -MP -MF .deps/tmpfile.Tpo -c tmpfile.cc -DDLL_EXPORT -DPIC -o .libs/tmpfile.o tmpfile.cc: In function ‘const char* spot::{anonymous}::get_tmpdir()’: tmpfile.cc:36:25: error: ‘secure_getenv’ was not declared in this scope const char* res = secure_getenv("SPOT_TMPDIR"); ^~~~~~~~~~~~~ tmpfile.cc: In destructor ‘virtual spot::temporary_file::~temporary_file()’: tmpfile.cc:89:32: error: ‘secure_getenv’ was not declared in this scope static bool must_unlink = !secure_getenv("SPOT_TMPKEEP"); [...] make: *** [Makefile:1194: all] Error 2 ===============================