Build of bmake with musl toolchain

# [tuscan]
# Server = file:///var/cache/pacman/pkg/

# :: Synchronizing package databases...
# downloading tuscan.db...

# /sysroot/lib
# /sysroot/share
# /sysroot/bin
# /sysroot/include
# /sysroot/libexec

# ==> Making package: bmake 20160604-1 (Tue Apr 4 23:21:56 UTC 2017)
# ==> Checking runtime dependencies...
# ==> Checking buildtime dependencies...
# ==> WARNING: Using existing $srcdir/ tree
# ==> Starting build()...
# NOTE: default prefix=/usr/local
# checking for gcc... clang
# checking for C compiler default output file name... a.out
# checking whether the C compiler works... configure: error: in `/tmp/bmake/src/bmake-build/linux4-x86_64':
# configure: error: cannot run C compiled programs.
# If you meant to cross compile, use `--host'.
# See `config.log' for more details.
# ==> ERROR: A failure occurred in build().
# Aborting...

# This file contains any messages produced by compilers while
# running configure, to aid debugging if configure makes a mistake.
#
# It was created by bmake configure 20151022, which was
# generated by GNU Autoconf 2.64. Invocation command line was
#
# $ /tmp/bmake/src/bmake/configure --prefix=/usr --with-default-sys-path=/usr/share/mk --with-mksrc=/tmp/bmake/src/bmake/mk
#
# ## --------- ##
# ## Platform. ##
# ## --------- ##
#
# hostname = d88482e616b2
# uname -m = x86_64
# uname -r = 4.10.6-1-ARCH
# uname -s = Linux
# uname -v = #1 SMP PREEMPT Mon Mar 27 08:28:22 CEST 2017
#
# /usr/bin/uname -p = unknown
# /bin/uname -X = unknown
#
# /bin/arch = unknown
# /usr/bin/arch -k = unknown
# /usr/convex/getsysinfo = unknown
# /usr/bin/hostinfo = unknown
# /bin/machine = unknown
# /usr/bin/oslevel = unknown
# /bin/universe = unknown
#
# PATH: /sysroot/bin
# PATH: /usr/local/sbin
# PATH: /usr/local/bin
# PATH: /usr/sbin
# PATH: /usr/bin
# PATH: /sbin
# PATH: /bin
#
#
# ## ----------- ##
# ## Core tests. ##
# ## ----------- ##
#
# configure:2423: checking for gcc
# configure:2450: result: clang
# configure:2679: checking for C compiler version
# configure:2688: clang --version >&5
# clang version 3.8.1
# Target: x86_64-unknown-linux-gnu
# Thread model: posix
# InstalledDir: /
# configure:2699: $? = 0
# configure:2688: clang -v >&5
# clang version 3.8.1
# Target: x86_64-unknown-linux-gnu
# Thread model: posix
# InstalledDir: /
# Found candidate GCC installation: //../lib/gcc/x86_64-pc-linux-gnu/6.1.1
# Found candidate GCC installation: //../lib64/gcc/x86_64-pc-linux-gnu/6.1.1
# Selected GCC installation: //../lib64/gcc/x86_64-pc-linux-gnu/6.1.1
# Candidate multilib: .;@m64
# Selected multilib: .;@m64
# configure:2699: $? = 0
# configure:2688: clang -V >&5
# clang-3.8: error: argument to '-V' is missing (expected 1 value)
# clang-3.8: error: no input files
# configure:2699: $? = 1
# configure:2688: clang -qversion >&5
# clang-3.8: error: unknown argument: '-qversion'
# clang-3.8: error: no input files
# configure:2699: $? = 1
# configure:2721: checking for C compiler default output file name
# configure:2743: clang conftest.c >&5
# configure:2747: $? = 0
# configure:2784: result: a.out
# configure:2800: checking whether the C compiler works
# configure:2809: ./a.out
# ./a.out: error while loading shared libraries: /usr/lib/libc.so: invalid ELF header
# configure:2813: $? = 127
# configure:2820: error: in `/tmp/bmake/src/bmake-build/linux4-x86_64':
# configure:2824: error: cannot run C compiled programs.
# If you meant to cross compile, use `--host'.
# See `config.log' for more details.
#
# ## ---------------- ##
# ## Cache variables. ##
# ## ---------------- ##
#
# ac_cv_env_CC_set=set
# ac_cv_env_CC_value=clang
# ac_cv_env_CFLAGS_set=set
# ac_cv_env_CFLAGS_value=
# ac_cv_env_CPPFLAGS_set=set
# ac_cv_env_CPPFLAGS_value=
# ac_cv_env_CPP_set=
# ac_cv_env_CPP_value=
# ac_cv_env_LDFLAGS_set=set
# ac_cv_env_LDFLAGS_value=
# ac_cv_env_LIBS_set=
# ac_cv_env_LIBS_value=
# ac_cv_env_build_alias_set=
# ac_cv_env_build_alias_value=
# ac_cv_env_host_alias_set=
# ac_cv_env_host_alias_value=
# ac_cv_env_target_alias_set=
# ac_cv_env_target_alias_value=
# ac_cv_prog_ac_ct_CC=clang
#
# ## ----------------- ##
# ## Output variables. ##
# ## ----------------- ##
#
# CC='clang'
# CFLAGS=''
# CPP=''
# CPPFLAGS=''
# DEFS=''
# ECHO_C=''
# ECHO_N='-n'
# ECHO_T=''
# EGREP=''
# EXEEXT=''
# GCC=''
# GREP=''
# INSTALL=''
# INSTALL_DATA=''
# INSTALL_PROGRAM=''
# INSTALL_SCRIPT=''
# LDFLAGS=''
# LIBOBJS=''
# LIBS=''
# LTLIBOBJS=''
# OBJEXT=''
# PACKAGE_BUGREPORT='sjg@NetBSD.org'
# PACKAGE_NAME='bmake'
# PACKAGE_STRING='bmake 20151022'
# PACKAGE_TARNAME='bmake'
# PACKAGE_URL=''
# PACKAGE_VERSION='20151022'
# PATH_SEPARATOR=':'
# SHELL='/bin/sh'
# ac_ct_CC='clang'
# ac_exe_suffix=''
# bindir='${exec_prefix}/bin'
# bmake_path_max=''
# build_alias=''
# datadir='${datarootdir}'
# datarootdir='${prefix}/share'
# default_sys_path=''
# diff_u=''
# docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
# dvidir='${docdir}'
# exec_prefix='NONE'
# filemon_h='no'
# force_machine=''
# host_alias=''
# htmldir='${docdir}'
# includedir='${prefix}/include'
# infodir='${datarootdir}/info'
# libdir='${exec_prefix}/lib'
# libexecdir='${exec_prefix}/libexec'
# localedir='${datarootdir}/locale'
# localstatedir='${prefix}/var'
# machine=''
# machine_arch=''
# mandir='${datarootdir}/man'
# mksrc=''
# oldincludedir='/usr/include'
# pdfdir='${docdir}'
# prefix='/usr'
# program_transform_name='s,x,x,'
# psdir='${docdir}'
# sbindir='${exec_prefix}/sbin'
# sharedstatedir='${prefix}/com'
# sysconfdir='${prefix}/etc'
# target_alias=''
# use_meta='yes'
#
# ## ----------- ##
# ## confdefs.h. ##
# ## ----------- ##
#
# /* confdefs.h */
# #define PACKAGE_NAME "bmake"
# #define PACKAGE_TARNAME "bmake"
# #define PACKAGE_VERSION "20151022"
# #define PACKAGE_STRING "bmake 20151022"
# #define PACKAGE_BUGREPORT "sjg@NetBSD.org"
# #define PACKAGE_URL ""
#
# configure: exit 1