Hi Bruno, Bruno Haible wrote
> Which Cygwin version, please? That error occurred, e.g., in a CI run https://github.com/gnu-octave/octave/actions/runs/8873331621/job/24358996111 The log of that run contains the following line: Starting cygwin install, version 2.932 Is that the Cygwin version? All packages should be the latest stable versions that are distributed by the Cygwin project. > Also, what is the gcc command line of this particular compilation unit? > (`make V=1`) The CI uses a parallel make. IIUC, the following lines in the log match and reproduce one of the errors: /bin/sh ../libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I. -I../../libgnu -I.. -Wno-cast-qual -Wno-conversion -Wno-float-equal -Wno-sign-compare -Wno-undef -Wno-unused-function -Wno-unused-parameter -Wno-float-conversion -Wimplicit-fallthrough -Wno-pedantic -Wno-sign-conversion -Wno-type-limits -Wno-unsuffixed-float-constants -g -O2 -MT libgnu_la-areadlink.lo -MD -MP -MF .deps/libgnu_la-areadlink.Tpo -c -o libgnu_la-areadlink.lo `test -f 'areadlink.c' || echo '../../libgnu/'`areadlink.c libtool: compile: gcc -DHAVE_CONFIG_H -I. -I../../libgnu -I.. -Wno-cast-qual -Wno-conversion -Wno-float-equal -Wno-sign-compare -Wno-undef -Wno-unused-function -Wno-unused-parameter -Wno-float-conversion -Wimplicit-fallthrough -Wno-pedantic -Wno-sign-conversion -Wno-type-limits -Wno-unsuffixed-float-constants -g -O2 -MT libgnu_la-areadlink.lo -MD -MP -MF .deps/libgnu_la-areadlink.Tpo -c ../../libgnu/areadlink.c -DDLL_EXPORT -DPIC -o .libs/libgnu_la-areadlink.o In file included from /usr/include/sys/reent.h:16, from /usr/include/stdlib.h:18, from ./stdlib.h:36, from ../../libgnu/areadlink.h:21, from ../../libgnu/areadlink.c:25: /usr/include/sys/_types.h:167:5: error: unknown type name 'wint_t' 167 | wint_t __wch; | ^~~~~~ Please, let me know if that is the information that you are looking for or if you need further details. Markus
