Build of dbus-sharp 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: dbus-sharp 0.8.1-1 (Wed Apr 5 00:52:54 UTC 2017)
# ==> Checking runtime dependencies...
# ==> Checking buildtime dependencies...
# ==> WARNING: Using existing $srcdir/ tree
# ==> Starting build()...
# checking for a BSD-compatible install... /usr/bin/install -c
# checking whether build environment is sane... yes
# checking for x86_64-unknown-linux-strip... no
# checking for strip... strip
# checking for a thread-safe mkdir -p... /usr/sbin/mkdir -p
# checking for gawk... gawk
# checking whether make sets $(MAKE)... yes
# checking whether make supports nested variables... yes
# checking whether to enable maintainer-specific portions of Makefiles... no
# checking for pkg-config... /usr/sbin/pkg-config
# checking for x86_64-unknown-linux-pkg-config... (cached) /usr/sbin/pkg-config
# checking pkg-config is at least version 0.9.0... yes
# checking for MONO... yes
# checking for gmcs... no
# configure: error: You need to install gmcs
# ==> 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 dbus-sharp configure 0.8.1, which was
# generated by GNU Autoconf 2.69. Invocation command line was
#
# $ ./configure --host=x86_64-unknown-linux --prefix=/usr --sysconfdir=/etc --localstatedir=/var
#
# ## --------- ##
# ## Platform. ##
# ## --------- ##
#
# hostname = d12687f2d86e
# 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:1795: checking for a BSD-compatible install
# configure:1863: result: /usr/bin/install -c
# configure:1874: checking whether build environment is sane
# configure:1929: result: yes
# configure:1988: checking for x86_64-unknown-linux-strip
# configure:2018: result: no
# configure:2028: checking for strip
# configure:2044: found /sysroot/bin/strip
# configure:2055: result: strip
# configure:2080: checking for a thread-safe mkdir -p
# configure:2119: result: /usr/sbin/mkdir -p
# configure:2126: checking for gawk
# configure:2142: found /usr/sbin/gawk
# configure:2153: result: gawk
# configure:2164: checking whether make sets $(MAKE)
# configure:2186: result: yes
# configure:2215: checking whether make supports nested variables
# configure:2232: result: yes
# configure:2359: checking whether to enable maintainer-specific portions of Makefiles
# configure:2368: result: no
# configure:2391: checking for pkg-config
# configure:2409: found /usr/sbin/pkg-config
# configure:2422: result: /usr/sbin/pkg-config
# configure:2447: checking for x86_64-unknown-linux-pkg-config
# configure:2477: result: /usr/sbin/pkg-config
# configure:2545: checking pkg-config is at least version 0.9.0
# configure:2548: result: yes
# configure:2558: checking for MONO
# configure:2565: $PKG_CONFIG --exists --print-errors "mono >= $MONO_REQ_VERSION"
# configure:2568: $? = 0
# configure:2582: $PKG_CONFIG --exists --print-errors "mono >= $MONO_REQ_VERSION"
# configure:2585: $? = 0
# configure:2643: result: yes
# configure:2650: checking for gmcs
# configure:2681: result: no
# configure:2690: error: You need to install gmcs
#
# ## ---------------- ##
# ## Cache variables. ##
# ## ---------------- ##
#
# ac_cv_env_MONO_CFLAGS_set=
# ac_cv_env_MONO_CFLAGS_value=
# ac_cv_env_MONO_LIBS_set=
# ac_cv_env_MONO_LIBS_value=
# ac_cv_env_NUNIT_CFLAGS_set=
# ac_cv_env_NUNIT_CFLAGS_value=
# ac_cv_env_NUNIT_LIBS_set=
# ac_cv_env_NUNIT_LIBS_value=
# ac_cv_env_PKG_CONFIG_LIBDIR_set=
# ac_cv_env_PKG_CONFIG_LIBDIR_value=
# ac_cv_env_PKG_CONFIG_PATH_set=
# ac_cv_env_PKG_CONFIG_PATH_value=
# ac_cv_env_PKG_CONFIG_set=
# ac_cv_env_PKG_CONFIG_value=
# ac_cv_env_build_alias_set=
# ac_cv_env_build_alias_value=
# ac_cv_env_host_alias_set=set
# ac_cv_env_host_alias_value=x86_64-unknown-linux
# ac_cv_env_target_alias_set=
# ac_cv_env_target_alias_value=
# ac_cv_path_GMCS=no
# ac_cv_path_PKG_CONFIG=/usr/sbin/pkg-config
# ac_cv_path_install='/usr/bin/install -c'
# ac_cv_path_mkdir=/usr/sbin/mkdir
# ac_cv_prog_AWK=gawk
# ac_cv_prog_ac_ct_STRIP=strip
# ac_cv_prog_make_make_set=yes
# am_cv_make_support_nested_variables=yes
# pkg_cv_MONO_CFLAGS=
# pkg_cv_MONO_LIBS=
#
# ## ----------------- ##
# ## Output variables. ##
# ## ----------------- ##
#
# ACLOCAL='${SHELL} /tmp/dbus-sharp/src/dbus-sharp-0.8.1/missing aclocal-1.14'
# AMTAR='$${TAR-tar}'
# AM_BACKSLASH='\'
# AM_DEFAULT_V='$(AM_DEFAULT_VERBOSITY)'
# AM_DEFAULT_VERBOSITY='1'
# AM_V='$(V)'
# API_VERSION='2.0'
# AUTOCONF='${SHELL} /tmp/dbus-sharp/src/dbus-sharp-0.8.1/missing autoconf'
# AUTOHEADER='${SHELL} /tmp/dbus-sharp/src/dbus-sharp-0.8.1/missing autoheader'
# AUTOMAKE='${SHELL} /tmp/dbus-sharp/src/dbus-sharp-0.8.1/missing automake-1.14'
# AWK='gawk'
# CYGPATH_W='echo'
# DEFS=''
# ECHO_C=''
# ECHO_N='-n'
# ECHO_T=''
# ENABLE_TESTS_FALSE=''
# ENABLE_TESTS_TRUE=''
# GACUTIL=''
# GMCS='no'
# INSTALL_DATA='${INSTALL} -m 644'
# INSTALL_PROGRAM='${INSTALL}'
# INSTALL_SCRIPT='${INSTALL}'
# INSTALL_STRIP_PROGRAM='$(install_sh) -c -s'
# LIBOBJS=''
# LIBS=''
# LTLIBOBJS=''
# MAINT='#'
# MAINTAINER_MODE_FALSE=''
# MAINTAINER_MODE_TRUE='#'
# MAKEINFO='${SHELL} /tmp/dbus-sharp/src/dbus-sharp-0.8.1/missing makeinfo'
# MKDIR_P='/usr/sbin/mkdir -p'
# MONO_CFLAGS=''
# MONO_LIBS=''
# NUNIT_CFLAGS=''
# NUNIT_LIBS=''
# PACKAGE='dbus-sharp'
# PACKAGE_BUGREPORT=''
# PACKAGE_NAME='dbus-sharp'
# PACKAGE_STRING='dbus-sharp 0.8.1'
# PACKAGE_TARNAME='dbus-sharp'
# PACKAGE_URL=''
# PACKAGE_VERSION='0.8.1'
# PATH_SEPARATOR=':'
# PKG_CONFIG='/usr/sbin/pkg-config'
# PKG_CONFIG_LIBDIR=''
# PKG_CONFIG_PATH=''
# SET_MAKE=''
# SHELL='/bin/sh'
# STRIP='strip'
# VERSION='0.8.1'
# XBUILD=''
# am__isrc=''
# am__leading_dot='.'
# am__tar='$${TAR-tar} chof - "$$tardir"'
# am__untar='$${TAR-tar} xf -'
# bindir='${exec_prefix}/bin'
# build_alias=''
# datadir='${datarootdir}'
# datarootdir='${prefix}/share'
# docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
# dvidir='${docdir}'
# exec_prefix='NONE'
# host_alias='x86_64-unknown-linux'
# htmldir='${docdir}'
# includedir='${prefix}/include'
# infodir='${datarootdir}/info'
# install_sh='${SHELL} /tmp/dbus-sharp/src/dbus-sharp-0.8.1/install-sh'
# libdir='${exec_prefix}/lib'
# libexecdir='${exec_prefix}/libexec'
# localedir='${datarootdir}/locale'
# localstatedir='/var'
# mandir='${datarootdir}/man'
# mkdir_p='$(MKDIR_P)'
# oldincludedir='/usr/include'
# pdfdir='${docdir}'
# prefix='/usr'
# program_transform_name='s,x,x,'
# psdir='${docdir}'
# sbindir='${exec_prefix}/sbin'
# sharedstatedir='${prefix}/com'
# sysconfdir='/etc'
# target_alias=''
#
# ## ----------- ##
# ## confdefs.h. ##
# ## ----------- ##
#
# /* confdefs.h */
# #define PACKAGE_NAME "dbus-sharp"
# #define PACKAGE_TARNAME "dbus-sharp"
# #define PACKAGE_VERSION "0.8.1"
# #define PACKAGE_STRING "dbus-sharp 0.8.1"
# #define PACKAGE_BUGREPORT ""
# #define PACKAGE_URL ""
# #define PACKAGE "dbus-sharp"
# #define VERSION "0.8.1"
#
# configure: exit 1