[Freeciv-Dev] (PR#4871) mingw32 build error in lockfile.c

["Per I. Mathisen" <per@xxxxxxxxxxx>]

gcc -DHAVE_CONFIG_H -I. -I. -I../.. -I../../common    -O3
-fomit-frame-pointer -Wall -Wpointer-arith -Wcast-align
-Wmissing-prototypes -Wmissing-declarations -c `test -f 'lockfile.c' ||
echo './'`lockfile.c
lockfile.c: In function `create_lock':
lockfile.c:77: variable `fl' has initializer but incomplete type
lockfile.c:77: `F_WRLCK' undeclared (first use in this function)
lockfile.c:77: (Each undeclared identifier is reported only once
lockfile.c:77: for each function it appears in.)
lockfile.c:77: warning: excess elements in struct initializer
lockfile.c:77: warning: (near initialization for `fl')
lockfile.c:77: warning: excess elements in struct initializer
lockfile.c:77: warning: (near initialization for `fl')
lockfile.c:77: warning: excess elements in struct initializer
lockfile.c:77: warning: (near initialization for `fl')
lockfile.c:77: warning: excess elements in struct initializer
lockfile.c:77: warning: (near initialization for `fl')
lockfile.c:77: warning: excess elements in struct initializer
lockfile.c:77: warning: (near initialization for `fl')
lockfile.c:77: storage size of `fl' isn't known
lockfile.c:91: warning: implicit declaration of function `fcntl'
lockfile.c:91: `F_SETLK' undeclared (first use in this function)
lockfile.c:77: warning: unused variable `fl'
lockfile.c: In function `remove_lock':
lockfile.c:114: variable `fl' has initializer but incomplete type
lockfile.c:114: `F_UNLCK' undeclared (first use in this function)
lockfile.c:114: warning: excess elements in struct initializer
lockfile.c:114: warning: (near initialization for `fl')
lockfile.c:114: warning: excess elements in struct initializer
lockfile.c:114: warning: (near initialization for `fl')

And so on. Please advise.

  - Per