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Don't include our own declaration of setpgrp if the system defines prototypes
for SysV functions (like setpgrp()). Not sure if this is the Right fix or not.
--- tcsh-6.12.00/sh.h 2004-02-10 11:35:44.000000000 -0500
+++ tcsh-6.12.00/sh.h 2004-02-10 11:35:40.000000000 -0500
@@ -474,7 +474,9 @@
extern pid_t getpgrp __P((void));
# endif /* BSD || SUNOS4 || IRISD || DGUX */
# endif /* POSIX */
+#ifndef _SVID_SOURCE
extern pid_t setpgrp __P((pid_t, pid_t));
+#endif
#endif /* !WINNT_NATIVE */
typedef sigret_t (*signalfun_t) __P((int));
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