Probably a missing include, quite likely caused by an autoconf
gcc -DHAVE_CONFIG_H -I. -I. -I.. -I../include -I/usr/local/include
-I/usr/kerberos/include -Wall -W -O2 -march=i386 -mcpu=i686 -fPIC -c
checkpw.c -fPIC -DPIC
cc1: warning: changing search order for system directory
cc1: warning: as it has already been specified as a non-system directory
checkpw.c: In function `shadow_verify_password':
checkpw.c:360: warning: implicit declaration of function `getspnam'
checkpw.c:360: warning: assignment makes pointer from integer without a
checkpw.c:363: dereferencing pointer to incomplete type
checkpw.c:364: warning: implicit declaration of function `crypt'
checkpw.c:364: warning: assignment makes pointer from integer without a
checkpw.c:365: dereferencing pointer to incomplete type
Also, -I/usr/local/include should be removed from CFLAGS.
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