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diff --git a/jni/iconv/m4/general.m4 b/jni/iconv/m4/general.m4
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+dnl Copyright (C) 1993-2003 Free Software Foundation, Inc.
+dnl This file is free software, distributed under the terms of the GNU
+dnl General Public License.  As a special exception to the GNU General
+dnl Public License, this file may be distributed as part of a program
+dnl that contains a configuration script generated by Autoconf, under
+dnl the same distribution terms as the rest of that program.
+
+dnl From Bruno Haible, Marcus Daniels, Sam Steingold.
+
+AC_PREREQ(2.13)
+
+dnl without AC_MSG_...:   with AC_MSG_... and caching:
+dnl   AC_TRY_CPP          CL_CPP_CHECK
+dnl   AC_TRY_COMPILE      CL_COMPILE_CHECK
+dnl   AC_TRY_LINK         CL_LINK_CHECK
+dnl   AC_TRY_RUN          CL_RUN_CHECK - would require cross-compiling support
+dnl Usage:
+dnl AC_TRY_CPP(INCLUDES,
+dnl            ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])
+dnl CL_CPP_CHECK(ECHO-TEXT, CACHE-ID,
+dnl              INCLUDES,
+dnl              ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])
+dnl AC_TRY_xxx(INCLUDES, FUNCTION-BODY,
+dnl            ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])
+dnl CL_xxx_CHECK(ECHO-TEXT, CACHE-ID,
+dnl              INCLUDES, FUNCTION-BODY,
+dnl              ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])
+
+AC_DEFUN([CL_CPP_CHECK],
+[AC_MSG_CHECKING(for $1)
+AC_CACHE_VAL($2,[
+AC_TRY_CPP([$3], $2=yes, $2=no)
+])
+AC_MSG_RESULT([$]$2)
+if test [$]$2 = yes; then
+  ifelse([$4], , :, [$4])
+ifelse([$5], , , [else
+  $5
+])dnl
+fi
+])
+
+AC_DEFUN([CL_COMPILE_CHECK],
+[AC_MSG_CHECKING(for $1)
+AC_CACHE_VAL($2,[
+AC_TRY_COMPILE([$3],[$4], $2=yes, $2=no)
+])
+AC_MSG_RESULT([$]$2)
+if test [$]$2 = yes; then
+  ifelse([$5], , :, [$5])
+ifelse([$6], , , [else
+  $6
+])dnl
+fi
+])
+
+AC_DEFUN([CL_LINK_CHECK],
+[AC_MSG_CHECKING(for $1)
+AC_CACHE_VAL($2,[
+AC_TRY_LINK([$3],[$4], $2=yes, $2=no)
+])
+AC_MSG_RESULT([$]$2)
+if test [$]$2 = yes; then
+  ifelse([$5], , :, [$5])
+ifelse([$6], , , [else
+  $6
+])dnl
+fi
+])
+
+dnl CL_SILENT(ACTION)
+dnl performs ACTION, with AC_MSG_CHECKING and AC_MSG_RESULT being defined away.
+AC_DEFUN([CL_SILENT],
+[pushdef([AC_MSG_CHECKING],[:])dnl
+pushdef([AC_CHECKING],[:])dnl
+pushdef([AC_MSG_RESULT],[:])dnl
+$1[]dnl
+popdef([AC_MSG_RESULT])dnl
+popdef([AC_CHECKING])dnl
+popdef([AC_MSG_CHECKING])dnl
+])
+
+dnl Expands to the "extern ..." prefix used for system declarations.
+dnl AC_LANG_EXTERN()
+AC_DEFUN([AC_LANG_EXTERN],
+[extern
+#ifdef __cplusplus
+"C"
+#endif
+])
+
+AC_DEFUN([CL_CC_WORKS],
+[AC_CACHE_CHECK(whether CC works at all, cl_cv_prog_cc_works, [
+AC_LANG_SAVE()
+AC_LANG_C()
+AC_TRY_RUN([int main() { exit(0); }],
+cl_cv_prog_cc_works=yes, cl_cv_prog_cc_works=no,
+AC_TRY_LINK([], [], cl_cv_prog_cc_works=yes, cl_cv_prog_cc_works=no))
+AC_LANG_RESTORE()
+])
+case "$cl_cv_prog_cc_works" in
+  *no) echo "Installation or configuration problem: C compiler cannot create executables."; exit 1;;
+  *yes) ;;
+esac
+])