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The configure script relied on bash-specific extensions to shell syntax
and behavior, causing build failures on systems with other /bin/sh
implementations. This commit replaces those with equivalent constructs
that should work in all POSIX shells.

Fixes #695.

glibc 2.28 no longer defines 'major' and 'minor' in <sys/types.h> and
requires us to include <sys/sysmacros.h>. (glibc 2.25 starts
deprecating the macros in <sys/types.h>.) Now do include the latter if
found on the system.

At the moment, let's also utilize AC_HEADER_MAJOR in configure script.
However as Autoconf 2.69 has not yet updated the AC_HEADER_MAJOR macro
to reflect the glibc change [1], so add a workaround code.

Fixes #663. Supersedes pull request #729.

Reference:
[1] https://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commit;h=e17a30e987d7ee695fb4294a82d987ec3dc9b974

Signed-off-by: Kang-Che Sung <explorer09@gmail.com>

Fixes #738.

Fixes #710.

Adds support for showing columns with linux delay accounting.

This information can be read from the netlink interface, and thus we set up a socket to read from that when initializing the LinuxProcessList (LinuxProcessList_initNetlinkSocket). After that, for each process we call LinuxProcessList_readDelayAcctData, which sends a message thru the socket after setting up a callback to get the answer from the Kernel. That callback sets the process total delay time attribute. We then set the delay percent as the percentage of time process cpu time since last scan.

The project builds a single standalone binary.

There are no libraries created - be that static or shared ones.
Thus there's no need for libtool.
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

This is/was necessary only on macOS, because you needed root in order
to read the process list. This was never necessary on Linux, and
it also raises security concerns, so now it needs to be enabled
explicitly at build time.

Closes #648.

Courtesy to OpenWRT environments as requested by @champtar in #540.

This will be used when cross-compiling with ncurses*-config generated for the
target, using constructs like
HTOP_NCURSES_CONFIG_SCRIPT=/path/to/ncurses5-config
Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>

3 effects in this commit, with the first being the main one:

1. Fix the "`missing' script is too old or missing" warning. See:
   <https://lists.gnu.org/archive/html/automake/2010-08/msg00108.html>

2. By moving AC_CANONICAL_TARGET down in order, we are now able to
   set the directory for auxiliary scripts. For now it's still './'.
   I added the line "AC_CONFIG_AUX_DIR([.])" to show that the directory
   change is possible.

3. AC_USE_SYSTEM_EXTENSIONS includes checks from AC_PROG_CC, by moving
   the former macro down, we can save size in 'configure' by not
   generating repeated checks.

AC_HELP_STRING -> AS_HELP_STRING
AC_TRY_COMPILE -> AC_COMPILE_IFELSE([AC_LANG_PROGRAM([...])],...)
AC_CONFIG_HEADER -> AC_CONFIG_HEADERS
AC_PROG_LIBTOOL -> LT_INIT

Note: There might be more deprecated macros that I haven't noticed.
I just wish to avoid painful highlighting from my text editor (gedit)
that complains about them. :)

Use a SOURCE_DATA_EPOCH friendly date.
Suggested by @fasterit in #476.

See #198.

when testing for ncurses library. See #198.

Ensure that all necessary libs and flags are passed along,
such as adding -ltinfo when needed.

Closes #198.

Closes #241.

Read OOM data only if column is enabled.
Make sort ordering more consistent. Closes #182.

Conflicts:
	Process.c
	Process.h
	ProcessList.c
	ScreenManager.c
	linux/LinuxProcessList.c

This is a work-in-progress, code is currently broken.
(Some actions, and notably, the header, are missing.)