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Index: arts-1.5.4/acinclude.m4
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===================================================================
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--- arts-1.5.4.orig/acinclude.m4
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+++ arts-1.5.4/acinclude.m4
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@@ -12040,28 +12040,12 @@ fi
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 ])# AC_LTDL_SYS_DLOPEN_DEPLIBS
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 AC_DEFUN([AC_LTDL_SHLIBEXT],
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-[AC_REQUIRE([AC_LTDL_SNARF_CONFIG])dnl
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+[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])dnl
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 AC_CACHE_CHECK([which extension is used for shared libraries],
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   libltdl_cv_shlibext, [dnl
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-(
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-  last=
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-	case "$host_os" in
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-    cygwin* | mingw*) 
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-      last=".dll" 
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-      ;;
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-    *)
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-      for spec in $library_names_spec; do
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-        last="$spec"
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-      done
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-      ;;
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-  esac
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-changequote(, )
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-  echo "$last" | sed 's/\[.*\]//;s/^[^.]*//;s/\$.*$//;s/\.$//' > conftest
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-changequote([, ])
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-)
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-libltdl_cv_shlibext=`cat conftest`
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-rm -f conftest
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-])
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+module=yes
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+eval libltdl_cv_shlibext=$shrext
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+  ])
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 if test -n "$libltdl_cv_shlibext"; then
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   AC_DEFINE_UNQUOTED(LTDL_SHLIB_EXT, "$libltdl_cv_shlibext",
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     [Define to the extension used for shared libraries, say, ".so". ])
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Index: arts-1.5.4/libltdl/ltdl.m4
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===================================================================
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--- arts-1.5.4.orig/libltdl/ltdl.m4
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+++ arts-1.5.4/libltdl/ltdl.m4
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@@ -118,27 +118,11 @@ fi
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 ])# AC_LTDL_SYS_DLOPEN_DEPLIBS
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 AC_DEFUN([AC_LTDL_SHLIBEXT],
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-[AC_REQUIRE([AC_LTDL_SNARF_CONFIG])dnl
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+[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])dnl
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 AC_CACHE_CHECK([which extension is used for shared libraries],
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   libltdl_cv_shlibext, [dnl
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-(
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-  last=
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-	case "$host_os" in
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-    cygwin* | mingw*) 
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-      last=".dll" 
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-      ;;
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-    *)
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-      for spec in $library_names_spec; do
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-        last="$spec"
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-      done
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-      ;;
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-  esac
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-changequote(, )
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-  echo "$last" | sed 's/\[.*\]//;s/^[^.]*//;s/\$.*$//;s/\.$//' > conftest
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-changequote([, ])
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-)
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-libltdl_cv_shlibext=`cat conftest`
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-rm -f conftest
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+module=yes
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+eval libltdl_cv_shlibext=$shrext
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 ])
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 if test -n "$libltdl_cv_shlibext"; then
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   AC_DEFINE_UNQUOTED(LTDL_SHLIB_EXT, "$libltdl_cv_shlibext",