[PROBLEM] perf requires python-devel to compile

[Pekka Enberg]

Hello,

I'm seeing this when I try to build perf in v3.9-rc7:

[penberg@golgotha perf]$ make
    CHK -fstack-protector-all
    CHK -Wstack-protector
    CHK -Wvolatile-register-var
    CHK -D_FORTIFY_SOURCE=2
    CHK bionic
    CHK libelf
    CHK libdw
Makefile:584: No libdw.h found or old libdw.h found or elfutils is
older than 0.138, disables dwarf support. Please install new
elfutils-devel/libdw-dev
    CHK libunwind
    CHK -DLIBELF_MMAP
    CHK libaudit
    CHK libnewt
Makefile:673: newt not found, disables TUI support. Please install
newt-devel or libnewt-dev
    CHK gtk2
    CHK -DHAVE_GTK_INFO_BAR
    CHK perl
Makefile:755: The path '/usr/bin/python-config' is not executable.
Makefile:755: *** Please set 'PYTHON_CONFIG' appropriately.  Stop.

The problem is that I didn't have python-devel package installed and
get-executable-or-default decides to error out instead of letting the
Makefile disable Python support.

                        Pekka
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