error while trying to run make

[Marianne Hommer]

Hello,
    I am trying to run make on GPG 2.1.21 and get the following errors. I do not see any errors from installing the pre req programs.

Thanks in advance

make  all-recursive
make[1]: Entering directory `/home/scsadmin/gnupg-2.1.21'
Making all in m4
make[2]: Entering directory `/home/scsadmin/gnupg-2.1.21/m4'
make[2]: Nothing to be done for `all'.
make[2]: Leaving directory `/home/scsadmin/gnupg-2.1.21/m4'
Making all in common
make[2]: Entering directory `/home/scsadmin/gnupg-2.1.21/common'
make  all-am
make[3]: Entering directory `/home/scsadmin/gnupg-2.1.21/common'
gcc -DHAVE_CONFIG_H -I. -I..  -DLOCALEDIR=\"/usr/local/share/locale\" -DGNUPG_BINDIR="\"/usr/local/bin\"" -DGNUPG_LIBEXECDIR="\"/usr/local/libexec\"" -DGNUPG_LIBDIR="\"/usr/local/lib/gnupg\"" -DGNUPG_DATADIR="\"/usr/local/share/gnupg\"" -DGNUPG_SYSCONFDIR="\"/usr/local/etc/gnupg\"" -DGNUPG_LOCALSTATEDIR="\"/usr/local/var\""        -I/usr/local/include -I/usr/local/include -I/usr/local/include -I/usr/local/include -DWITHOUT_NPTH=1 -Wall -Wno-pointer-sign -Wpointer-arith  -g -O2 -MT libcommon_a-sysutils.o -MD -MP -MF .deps/libcommon_a-sysutils.Tpo -c -o libcommon_a-sysutils.o `test -f 'sysutils.c' || echo './'`sysutils.c
sysutils.c: In function ‘gnupg_inotify_watch_socket’:
sysutils.c:1163: error: ‘IN_EXCL_UNLINK’ undeclared (first use in this function)
sysutils.c:1163: error: (Each undeclared identifier is reported only once
sysutils.c:1163: error: for each function it appears in.)
make[3]: *** [libcommon_a-sysutils.o] Error 1
make[3]: Leaving directory `/home/scsadmin/gnupg-2.1.21/common'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/home/scsadmin/gnupg-2.1.21/common'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/scsadmin/gnupg-2.1.21'
make: *** [all] Error 2
-------------- next part --------------
An HTML attachment was scrubbed...
URL: </pipermail/attachments/20170607/b7382ffb/attachment.html>