Build of serd with clang_glibc toolchain

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

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

# /toolchain_root/sysroot --> /sysroot/sysroot
# /toolchain_root/lib --> /sysroot/lib
# /toolchain_root/sbin --> /sysroot/sbin
# /toolchain_root/lib64 --> /sysroot/lib64
# /toolchain_root/etc --> /sysroot/etc
# /toolchain_root/share --> /sysroot/share
# /toolchain_root/bin --> /sysroot/bin
# /toolchain_root/var --> /sysroot/var
# /toolchain_root/usr --> /sysroot/usr
# /toolchain_root/glibc-build --> /sysroot/glibc-build
# /toolchain_root/x86_64-pc-linux-gnu --> /sysroot/x86_64-pc-linux-gnu
# /toolchain_root/include --> /sysroot/include
# /toolchain_root/libexec --> /sysroot/libexec

# ==> Making package: serd 0.22.0-1 (Thu Apr 13 18:02:26 UTC 2017)
# ==> Checking runtime dependencies...
# ==> Checking buildtime dependencies...
# ==> WARNING: Using existing $srcdir/ tree
# ==> Starting build()...
# waf [commands] [options]
#
# Main commands (example: ./waf build -j4)
# build : executes the build
# clean : cleans the project
# configure: configures the project
# dist : makes a tarball for redistributing the sources
# distcheck: checks if the project compiles (tarball from 'dist')
# distclean: removes the build directory
# install : installs the targets on the system
# list : lists the targets to execute
# step : executes tasks in a step-by-step fashion, for debugging
# uninstall: removes the targets installed
#
# Options:
# --version show program's version number and exit
# -h, --help show this help message and exit
# -c COLORS, --color=COLORS
# whether to use colors (yes/no/auto) [default: auto]
# -j JOBS, --jobs=JOBS amount of parallel jobs (16)
# -k, --keep continue despite errors (-kk to try harder)
# -v, --verbose verbosity level -v -vv or -vvv [default: 0]
# --zones=ZONES debugging zones (task_gen, deps, tasks, etc)
# --debug Build debuggable binaries
# --pardebug Build parallel-installable debuggable libraries with D
# suffix
# --grind Run tests in valgrind
# --strict Use strict compiler flags and show all warnings
# --ultra-strict Use even stricter compiler flags (likely to trigger many
# warnings in library headers)
# --docs Build documentation - requires doxygen
# --no-utils Do not build command line utilities
# --test Build unit tests
# --no-coverage Do not use gcov for code coverage
# --stack-check Include runtime stack sanity checks
# --static Build static library
# --no-shared Do not build shared library
# --static-progs Build programs as static binaries
# --largefile Build with large file support on 32-bit systems
# --no-posix Do not use posix_memalign, posix_fadvise, and fileno,
# even if present
#
# Configuration options:
# -o OUT, --out=OUT build dir for the project
# -t TOP, --top=TOP src dir for the project
# --check-c-compiler=CHECK_C_COMPILER
# list of C compilers to try [gcc clang icc]
#
# Build and installation options:
# -p, --progress -p: progress bar; -pp: ide output
# --targets=TARGETS task generators, e.g. "target1,target2"
#
# Step options:
# --files=FILES files to process, by regexp, e.g.
# "*/main.c,*/test/main.o"
#
# Installation and uninstallation options:
# -f, --force force file installation
# --distcheck-args=ARGS
# arguments to pass to distcheck
#
# Installation directories:
# --prefix=PREFIX installation prefix [default: '/usr/local/']
# --destdir=DESTDIR installation root [default: '']
# --bindir=BINDIR Executable programs [Default: PREFIX/bin]
# --configdir=CONFIGDIR
# Configuration data [Default: PREFIX/etc]
# --datadir=DATADIR Shared data [Default: PREFIX/share]
# --includedir=INCLUDEDIR
# Header files [Default: PREFIX/include]
# --libdir=LIBDIR Libraries [Default: PREFIX/lib]
# --mandir=MANDIR Manual pages [Default: DATADIR/man]
# --docdir=DOCDIR HTML documentation [Default: DATADIR/doc]
# waf: error: no such option: --host
# ==> ERROR: A failure occurred in build().
# Aborting...