autoconf's model is that --enable- options are for use with features you
turn on and off, and --with- options are for use with external packages
(libraries, etc.) with which to link the software.
The help message from configure scripts reflects that model:
Optional Features:
--disable-FEATURE do not include FEATURE (same as
--enable-FEATURE=no)
--enable-FEATURE[=ARG] include FEATURE [ARG=yes]
...
--enable-threads use threads in wireshark. [default=no]
--enable-profile-build build profile-ready binaries. [default=no]
...
Optional Packages:
--with-PACKAGE[=ARG] use PACKAGE [ARG=yes]
--without-PACKAGE do not use PACKAGE (same as --with-PACKAGE=no)
--with-gnu-ld assume the C compiler uses GNU ld [default=no]
--with-pic try to use only PIC/non-PIC objects [default=use
both]
...
--with-pcap[=DIR] use libpcap for packet capturing.
[default=yes]
--with-zlib[=DIR] use zlib (located in directory DIR, if supplied) to
read compressed data. [default=yes, if
available]
The match isn't perfect (arguably, "--with-pic" should be
"--enable-pic"), but it's fairly close.
I've checked in changes to have "--enable-extra-gcc-checks" and
"--enable-warnings-as-errors", rather than "--with-extra-gcc-checks" and
"--with-warnings-as-errors", to match that.
