* automake.in (handle_merge_targets): Use double quotes around
setting of INSTALL_STRIP_PROGRAM.
* m4/strip.m4 (AM_PROG_INSTALL_STRIP): Set INSTALL_STRIP_PROGRAM
to absolute path at runtime.
(AM_PROG_STRIP): Don't explicitly test $STRIP.
* m4/strip.m4: New file.
* m4/Makefile.am (m4data_DATA): Add strip.m4.
* m4/init.m4: Call AM_PROG_INSTALL_STRIP.
* m4/missing.m4 (AM_AUX_DIR_EXPAND): New function.
(AM_MISSING_INSTALL_SH, AM_MISSING_HAS_RUN): Use $am_aux_dir instead
of $ac_aux_dir, and require AM_AUX_DIR_EXPAND.
* m4/depend.m4 (AM_DEP_TRACK): Likewise.
* automake.in (handle_merge_targets): In the install-strip rule,
set INSTALL_PROGRAM to INSTALL_STRIP_PROGRAM, and INSTALL_PROGRAM_ENV
to INSTALL_STRIP_PROGRAM_ENV; don't use INSTALL_STRIP_FLAG.
* progs.am (install-@DIR@PROGRAMS): Adapt to use INSTALL_PROGRAM_ENV,
don't use INSTALL_STRIP_FLAG any longer.
* header-vars.am (INSTALL_STRIP_FLAG): Remove.
(INSTALL_PROGRAM_ENV): New variable.