Hi, i encountered 2 similar errors in an attempt to build check-0.14.0 and popt-1.16 on latest msys2.
... ./.libs/lt-ex_output.c: In function 'main': ./.libs/lt-ex_output.c:319:16: warning: implicit declaration of function '_spawnv'; did you mean 'spawnv'? [-Wimplicit-function-declaration] 319 | rval = (int) _spawnv (_P_WAIT, lt_argv_zero, (const char * const *) newargz); | ^~~~~~~ | spawnv A bit more detailed on https://pastebin.com/VKnYxXXm For libcheck the problem can be solved by using cmake to build it. But autotools/automake build system should work, too, as long as it is supported. What i hope will be until the end of the universe :) Configuring with any CFLAGS=-D_XOPEN_SOURCE=500 or such did not solve the problem. Any help apreciated. -- tdkueh...@ncot.de <tdkueh...@ncot.de>