+AC_DEFUN(jm_PREREQ_ADDEXT,
+[
+ dnl For addext.c.
+ AC_SYS_LONG_FILE_NAMES
+ AC_CHECK_FUNC(pathconf)
+ AC_CHECK_HEADERS(limits.h string.h unistd.h)
+])
+
+AC_DEFUN(jm_PREREQ_CANON_HOST,
+[
+ dnl Add any libraries as early as possible.
+ dnl In particular, inet_ntoa needs -lnsl at least on Solaris5.5.1,
+ dnl so we have to add -lnsl to LIBS before checking for that function.
+ AC_SEARCH_LIBS(gethostbyname, [inet nsl])
+
+ dnl These come from -lnsl on Solaris5.5.1.
+ AC_CHECK_FUNCS(gethostbyname gethostbyaddr inet_ntoa)
+
+ AC_CHECK_FUNCS(gethostbyname gethostbyaddr inet_ntoa)
+ AC_CHECK_HEADERS(unistd.h string.h netdb.h sys/socket.h \
+ netinet/in.h arpa/inet.h)
+])
+
+AC_DEFUN(jm_PREREQ_QUOTEARG,
+[
+ AC_CHECK_FUNCS(isascii mbrtowc)
+ AC_CHECK_HEADERS(limits.h stdlib.h string.h wchar.h wctype.h)
+ AC_HEADER_STDC
+ AC_C_BACKSLASH_A
+ AM_C_PROTOTYPES
+])
+
+AC_DEFUN(jm_PREREQ_READUTMP,
+[
+ AC_HEADER_STDC
+ AC_CHECK_HEADERS(string.h utmpx.h sys/param.h)
+ AC_CHECK_FUNCS(utmpname)
+ AM_C_PROTOTYPES
+])
+