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configure: define posix source on cygwin
Some function definitions are missing without it, for example sigaction. Fixes ticket #5868
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configure
vendored
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configure
vendored
@ -4802,6 +4802,7 @@ case $target_os in
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objformat="win32"
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enable dos_paths
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enabled shared && ! enabled small && check_cmd $windres --version && enable gnu_windres
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add_cppflags -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600
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;;
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*-dos|freedos|opendos)
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network_extralibs="-lsocket"
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