Further enhance the check for needed tools:
- update the tool_pattern to use ' || ' as a pattern separator
- which allows using | in regexp
- add checks for cut and xargs
- manually check for grep and sed because they are needed when checking for tools
- print why a test failed, with each tested tool and regexp
- move tools checks before options parsing
- apply conttibutions before computing the version string
- inform user to run make && make install

/trunk/configure | 173 111 62 0 ++++++++++++++++++++++++++++++++++++++++----------------------
1 file changed, 111 insertions(+), 62 deletions(-)

# libelf config file

config TOOL_libelf

    help

      libelf lets you read, modify or create ELF files in an

      architecture-independent way.

choice

    bool

    prompt "libelf version"

config LIBELF_V_0_8_10

    bool

    prompt "0.8.10"

# CT_INSERT_VERSION_ABOVE

# Don't remove above line!

endchoice

config LIBELF_VERSION

    string

    default "0.8.10" if LIBELF_V_0_8_10

# CT_INSERT_VERSION_STRING_ABOVE

# Don't remove above line!