AC_CHECK_HEADERS works but AC_SEARCH_LIBS does not

[Sam Steingold]

I have a package (PARI) installed under /usr/local.
I have this (in a different package which wants to use PARI):

=== configure.in ===
AC_MSG_NOTICE([* PARI (Headers)])
AC_CHECK_HEADERS(pari/pari.h, break)
if test "$ac_cv_header_pari_pari_h" = "no";
then AC_MSG_ERROR([cannot find PARI headers])
fi

AC_MSG_NOTICE([ * PARI (Functions):])
AC_SEARCH_LIBS(pari_kernel_init, pari)
if test "$ac_cv_search_pari_kernel_init" = "no";
then AC_MSG_ERROR([cannot find PARI library])
fi
=== configure.in ===

I get this:

checking pari/pari.h usability... yes
checking pari/pari.h presence... yes
checking for pari/pari.h... yes
configure:  * PARI (Functions):
checking for library containing pari_kernel_init... no
configure: error: cannot find PARI library

and in config.log:

configure:2970: gcc -o conftest.exe -g -O2   conftest.c -lpari   >&5
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/../../../../i686-pc-cygwin/bin/ld: cannot
find -lpari
collect2: ld returned 1 exit status
configure:2976: $? = 1
configure: failed program was:
| /* confdefs.h.  */
|
| #define PACKAGE_NAME "pari"
| #define PACKAGE_TARNAME "pari"
| #define PACKAGE_VERSION "1.0"
| #define PACKAGE_STRING "pari 1.0"
| #define PACKAGE_BUGREPORT "clisp-list"
| #define STDC_HEADERS 1
| #define HAVE_SYS_TYPES_H 1
| #define HAVE_SYS_STAT_H 1
| #define HAVE_STDLIB_H 1
| #define HAVE_STRING_H 1
| #define HAVE_MEMORY_H 1
| #define HAVE_STRINGS_H 1
| #define HAVE_INTTYPES_H 1
| #define HAVE_STDINT_H 1
| #define HAVE_UNISTD_H 1
| #define HAVE_PARI_PARI_H 1
| /* end confdefs.h.  */
|
| /* Override any gcc2 internal prototype to avoid an error.  */
| #ifdef __cplusplus
| extern "C"
| #endif
| /* We use char because int might match the return type of a gcc2
|    builtin and then its argument prototype would still apply.  */
| char pari_kernel_init ();
| int
| main ()
| {
| pari_kernel_init ();
|   ;
|   return 0;
| }
configure:3004: result: no
configure:3012: error: cannot find PARI library

how come gcc looks in /usr/local/include but not in /usr/local/lib?

$ ls -l /usr/local/include/
total 33
  29 -rw-r--r--    1 sds      mkgroup-    29564 Jul 19 12:27 dmalloc.h
   4 drwxrwxr-x+   2 sds      mkgroup-     4096 Dec 13 12:14 pari/
$ ls -l /usr/local/include/pari
total 157
   0 lrwxrwxrwx    1 sds      mkgroup-        6 Dec 13 12:14 genpari.h -> pari.h
   2 -rw-r--r--    1 sds      mkgroup-     2020 Dec 13 12:14 pari.h
   7 -rw-r--r--    1 sds      mkgroup-     7009 Dec 13 12:14 paricast.h
   2 -rw-r--r--    1 sds      mkgroup-     1533 Dec 13 12:14 paricfg.h
  12 -rw-r--r--    1 sds      mkgroup-    11269 Dec 13 12:14 paricom.h
  64 -rw-r--r--    1 sds      mkgroup-    64906 Dec 13 12:14 paridecl.h
   2 -rw-r--r--    1 sds      mkgroup-     1434 Dec 13 12:14 parierr.h
   5 -rw-r--r--    1 sds      mkgroup-     4846 Dec 13 12:14 parigen.h
  30 -rw-r--r--    1 sds      mkgroup-    30447 Dec 13 12:14 pariinl.h
   4 -rw-r--r--    1 sds      mkgroup-     3285 Dec 13 12:14 parinf.h
   2 -rw-r--r--    1 sds      mkgroup-     1723 Dec 13 12:14 pariold.h
   5 -rw-r--r--    1 sds      mkgroup-     4936 Dec 13 12:14 pariport.h
  13 -rw-r--r--    1 sds      mkgroup-    12439 Dec 13 12:14 paripriv.h
   3 -rw-r--r--    1 sds      mkgroup-     2938 Dec 13 12:14 paristio.h
   2 -rw-r--r--    1 sds      mkgroup-     1903 Dec 13 12:14 parisys.h
   2 -rw-r--r--    1 sds      mkgroup-     1401 Dec 13 12:14 paritune.h
   2 -rw-r--r--    1 sds      mkgroup-     1680 Dec 13 12:14 paritype.h
$ ls -l /usr/local/lib
total 657
 316 -rw-r--r--    1 sds      mkgroup-   323336 Jul 19 12:27 libdmalloc.a
 341 -rw-r--r--    1 sds      mkgroup-   348892 Jul 19 12:27 libdmallocxx.a
   0 lrwxrwxrwx    1 sds      mkgroup-       15 Dec 13 12:14 libpari-2.2.dll -> 
libpari-2.2.dll
   0 lrwxrwxrwx    1 sds      mkgroup-       15 Dec 13 12:14 libpari.dll -> 
libpari-2.2.dll
   0 drwxrwxr-x+   2 sds      mkgroup-        0 Dec 13 12:16 pari/

--
Sam Steingold (http://www.podval.org/~sds) running w2k
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