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After installing ghostscript, I can go further the error but get a new one after:

[gnuradio-runtime/swig/CMakeFiles/runtime_swig_swig_doc.dir/build.make:66: gnuradio-runtime/swig/runtime_swig_doc_swig_docs/xml/index.xml] Segmentation fault (core dumped)

You should ad ghostscript as dependencies, because build failed:

[ 15%] Building CXX object gnuradio-runtime/lib/CMakeFiles/gnuradio-runtime.dir/sptr_magic.cc.o
This is pdfTeX, Version 3.14159265-2.6-1.40.17 (TeX Live 2016/Arch Linux) (preloaded format=latex)
restricted \write18 enabled.
entering extended mode
(./_formulas.tex
LaTeX2e <2016/03/31> patch level 3
Babel <3.9r> and hyphenation patterns for 83 language(s) loaded.
(/usr/share/texmf-dist/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/usr/share/texmf-dist/tex/latex/base/size10.clo))
(/usr/share/texmf-dist/tex/latex/graphics/epsfig.sty
(/usr/share/texmf-dist/tex/latex/graphics/graphicx.sty
(/usr/share/texmf-dist/tex/latex/graphics/keyval.sty)
(/usr/share/texmf-dist/tex/latex/graphics/graphics.sty
(/usr/share/texmf-dist/tex/latex/graphics/trig.sty)
(/usr/share/texmf-dist/tex/latex/graphics-cfg/graphics.cfg)
(/usr/share/texmf-dist/tex/latex/graphics-def/dvips.def))))
(/usr/share/texmf-dist/tex/latex/amsmath/amsmath.sty
For additional information on amsmath, use the `?' option.
(/usr/share/texmf-dist/tex/latex/amsmath/amstext.sty
(/usr/share/texmf-dist/tex/latex/amsmath/amsgen.sty))
(/usr/share/texmf-dist/tex/latex/amsmath/amsbsy.sty)
(/usr/share/texmf-dist/tex/latex/amsmath/amsopn.sty))
(/usr/share/texmf-dist/tex/latex/amsfonts/amssymb.sty
(/usr/share/texmf-dist/tex/latex/amsfonts/amsfonts.sty))
No file _formulas.aux.
(/usr/share/texmf-dist/tex/latex/amsfonts/umsa.fd)
(/usr/share/texmf-dist/tex/latex/amsfonts/umsb.fd) [1] [2] [3] [4] [5] [6]
[7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21]
[22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36]
[37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51]
[52] [53] [54] [55] [56] (./_formulas.aux) )
Output written on _formulas.dvi (56 pages, 9248 bytes).
Transcript written on _formulas.log.
sh: gs: command not found
error: Problem running ghostscript gs -q -g50x40 -r384x384x -sDEVICE=ppmraw -sOutputFile=_form0.pnm -dNOPAUSE -dBATCH -- _form0.ps. Check your installation!
[ 15%] Building CXX object gnuradio-runtime/lib/CMakeFiles/gnuradio-runtime.dir/sync_block.cc.o
make[2]: *** [docs/doxygen/CMakeFiles/doxygen_target.dir/build.make:62: docs/doxygen/xml] Segmentation fault (core dumped)
make[1]: *** [CMakeFiles/Makefile2:139: docs/doxygen/CMakeFiles/doxygen_target.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

Built a.o.k. here in mid-feb-17

I was trying to update, received this error, as a side note, I have been trying to build from source, I was able to do it two weeks ago, but have had the same errors this week with a new attempt. I should add that I got to 71% before my errors occured.
[ 65%] Building CXX object gr-comedi/lib/CMakeFiles/gnuradio-comedi.dir/sink_s_impl.cc.o
[ 65%] Building CXX object gr-comedi/lib/CMakeFiles/gnuradio-comedi.dir/source_s_impl.cc.o
[ 65%] Linking CXX shared library libgnuradio-comedi-3.7.11git.so
/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/../../../../lib/libcomedi.a(libcomedi_la-cmd.o): relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/../../../../lib/libcomedi.a(libcomedi_la-comedi.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/../../../../lib/libcomedi.a(libcomedi_la-error.o): relocation R_X86_64_TPOFF32 against symbol `__comedi_errno' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/../../../../lib/libcomedi.a(libcomedi_la-filler.o): relocation R_X86_64_32 against `.rodata.str1.8' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/../../../../lib/libcomedi.a(libcomedi_la-ioctl.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: libgnuradio-comedi-3.7.11git.so.0.0.0: version node not found for symbol comedi_get_front_count@@v0.7.18
/usr/bin/ld: failed to set dynamic section sizes: Bad value
collect2: error: ld returned 1 exit status
make[2]: *** [gr-comedi/lib/CMakeFiles/gnuradio-comedi.dir/build.make:138: gr-comedi/lib/libgnuradio-comedi-3.7.11git.so.0.0.0] Error 1
make[1]: *** [CMakeFiles/Makefile2:9824: gr-comedi/lib/CMakeFiles/gnuradio-comedi.dir/all] Error 2
make: *** [Makefile:161: all] Error 2
==> ERROR: A failure occurred in build().
Aborting...
==> ERROR: Makepkg was unable to build gnuradio-git.

scotchnsoda: applied the changes

The pkgbuild is still out of date. As keenerd said, need to add 'libvolk' to depends, and remove line 41-44 ( all the stuff about pulling volk submodule). The flag -DENABLE_INTERNAL_VOLK=OFF should be added too.

Also, they restructured the grc/ directory. pkgbuild also needs the following edits.
line 46:
sed -i -e "s|GR_PKG_LIBEXEC_DIR|GR_RUNTIME_DIR|" grc/scripts/freedesktop/CMakeLists.txt
line 70:
cd "$srcdir/$_gitname/grc/freedesktop"

Volk has issues when building with cmake 3.5. I've created a libvolk-git package to fix this. (And will be making an official volk package for the repositories.) Could you remove the submodules stuff, add 'libvolk' to the depends, and use the -DENABLE_INTERNAL_VOLK=OFF switch?

@keenerd: updated

Here is an updated pkgbuild: http://kmkeen.com/tmp/PKGBUILD.gnuradio-git

A couple of dependency issues:

- wxpython optional dependency should be wxpython2.8. AFAIK gnuradio does not support wxpython 3.0
- there is on optional dependency on pyxml, which does not exist in arch or AUR.