new file mode 100644
--- /dev/null
+++ b/m4/lib-check.m4
@@ -0,0 +1,54 @@
+#serial 1
+
+dnl Misc lib-related macros for fileutils, sh-utils, textutils.
+
+AC_DEFUN(jm_MACROS,
+[
+
+  # Check for libypsec.a on Dolphin M88K machines.
+  AC_CHECK_LIB(ypsec, main)
+
+  # m88k running dgux 5.4 needs this
+  AC_CHECK_LIB(ldgc, main)
+
+  # Some programs need to link with -lm.  printf does if it uses
+  # lib/strtod.c which uses pow.  And seq uses the math functions,
+  # floor, modf, rint.  And factor uses sqrt.  And sleep uses fesetround.
+
+  # Save a copy of $LIBS and add $FLOOR_LIBM before these tests
+  # Check for these math functions used by seq.
+  ac_su_saved_lib="$LIBS"
+  LIBS="$LIBS -lm"
+  AC_CHECK_FUNCS(floor modf rint)
+  LIBS="$ac_su_saved_lib"
+
+  AC_SUBST(SQRT_LIBM)
+  AC_CHECK_FUNCS(sqrt)
+  if test $ac_cv_func_sqrt = no; then
+    AC_CHECK_LIB(m, sqrt, [SQRT_LIBM=-lm])
+  fi
+
+  AC_SUBST(FESETROUND_LIBM)
+  AC_CHECK_FUNCS(fesetround)
+  if test $ac_cv_func_fesetround = no; then
+    AC_CHECK_LIB(m, fesetround, [FESETROUND_LIBM=-lm])
+  fi
+
+  # The -lsun library is required for YP support on Irix-4.0.5 systems.
+  # m88k/svr3 DolphinOS systems using YP need -lypsec for id.
+  AC_SEARCH_LIBS(yp_match, [sun ypsec])
+
+  # SysV needs -lsec, older versions of Linux need -lshadow for
+  # shadow passwords.
+  AC_SEARCH_LIBS(getspnam, [shadow sec])
+
+  AC_EGREP_HEADER(sp_pwdp, shadow.h,
+		  AC_CHECK_FUNC(getspnam, AC_DEFINE(HAVE_SHADOW_H)))
+
+  # SCO-ODT-3.0 is reported to need -lufc for crypt.
+  # NetBSD needs -lcrypt for crypt.
+  ac_su_saved_lib="$LIBS"
+  AC_SEARCH_LIBS(crypt, [ufc crypt], [LIB_CRYPT="$ac_cv_search_crypt"])
+  LIBS="$ac_su_saved_lib"
+  AC_SUBST(LIB_CRYPT)
+])