Use newer autotools. Only build debug.c when --enable-debug.

aclocal.m4

@@ -13,8 +13,8 @@
 
 m4_ifndef([AC_AUTOCONF_VERSION],
   [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
-m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.63],,
-[m4_warning([this file was generated for autoconf 2.63.
+m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.68],,
+[m4_warning([this file was generated for autoconf 2.68.
 You have another version of autoconf.  It may work, but is not guaranteed to.
 If you have problems, you may need to regenerate the build system entirely.
 To do so, use the procedure documented by the package, typically `autoreconf'.])])
@@ -28,7 +28,7 @@ To do so, use the procedure documented by the package, typically `autoreconf'.])
 # unlimited permission to copy and/or distribute it, with or without
 # modifications, as long as this notice is preserved.
 
-# serial 17 LTDL_INIT
+# serial 18 LTDL_INIT
 
 # LT_CONFIG_LTDL_DIR(DIRECTORY, [LTDL-MODE])
 # ------------------------------------------
@@ -428,10 +428,16 @@ AC_CHECK_HEADERS([unistd.h dl.h sys/dl.h dld.h mach-o/dyld.h dirent.h],
 AC_CHECK_FUNCS([closedir opendir readdir], [], [AC_LIBOBJ([lt__dirent])])
 AC_CHECK_FUNCS([strlcat strlcpy], [], [AC_LIBOBJ([lt__strl])])
 
+m4_pattern_allow([LT_LIBEXT])dnl
 AC_DEFINE_UNQUOTED([LT_LIBEXT],["$libext"],[The archive extension])
 
+name=
+eval "lt_libprefix=\"$libname_spec\""
+m4_pattern_allow([LT_LIBPREFIX])dnl
+AC_DEFINE_UNQUOTED([LT_LIBPREFIX],["$lt_libprefix"],[The archive prefix])
+
 name=ltdl
-LTDLOPEN=`eval "\\$ECHO \"$libname_spec\""`
+eval "LTDLOPEN=\"$libname_spec\""
 AC_SUBST([LTDLOPEN])
 ])# _LTDL_SETUP
 
@@ -488,7 +494,7 @@ AC_CACHE_CHECK([whether deplibs are loaded by dlopen],
   freebsd* | dragonfly*)
     lt_cv_sys_dlopen_deplibs=yes
     ;;
-  gnu* | linux* | k*bsd*-gnu)
+  gnu* | linux* | k*bsd*-gnu | kopensolaris*-gnu)
     # GNU and its variants, using gnu ld.so (Glibc)
     lt_cv_sys_dlopen_deplibs=yes
     ;;