Pull over depends and build changes from zc.v0.10.0.latest. Fails to build due to new ./configure dependency for serialization stuff.

depends/packages/libgmp.mk

@@ -0,0 +1,19 @@
+package=libgmp
+$(package)_version=6.0.0a
+$(package)_download_path=https://gmplib.org/download/gmp/
+$(package)_file_name=gmp-6.0.0a.tar.bz2
+$(package)_sha256_hash=7f8e9a804b9c6d07164cf754207be838ece1219425d64e28cfa3e70d5c759aaf
+$(package)_dependencies=
+$(package)_config_opts=--enable-cxx --disable-shared
+
+define $(package)_config_cmds
+  $($(package)_autoconf)
+endef
+
+define $(package)_build_cmds
+  $(MAKE) CPPFLAGS='-fPIC'
+endef
+
+define $(package)_stage_cmds
+  $(MAKE) DESTDIR=$($(package)_staging_dir) install ; echo '=== staging find for $(package):' ; find $($(package)_staging_dir)
+endef