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* especially to improve building on FreeBSD 11
* We need GNU Make, yet alone because Scintilla/Scinterm
needs it. We now document that dependency and added
an Autoconf check from the autoconf-archive.
We make sure that the build process is invoked with GNU make
by generating only GNUmakefiles.
The Makefile.am files have not been renamed, so this
change can be rolled back easily.
* Some GNU-Make-specific autoreconf warnings have still been
resolved. But not all of them, as this would have been
unelegant and we need GNU Make anyway.
* Declare ACLOCAL_AMFLAGS to appease autoreconf
* Added an explicit check for C++11 from the autoconf-archives.
In general we should support building with every C++11 compiler
that is sufficiently GNU-like.
* Do not use `sed` for inplace editing, as different sed-implementations
have mutually incompatible syntax for this.
Instead of declaring and checking a dependency on GNU sed,
we simply use SciTECO for the editing task.
This improves code portability on BSDs.
* Similarily, BSD/POSIX `cmp` is supported now.
This fixes the test suite on BSD without declaring a
dependency on the GNU coreutils.
* Simplified sciteco-wrapper generation.
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