macifiy the build so that this compiles on a mac

zcutil/build-mac.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+export CC=gcc-5
+export CXX=g++-5
+export LIBTOOL=libtool
+export AR=ar
+export RANLIB=ranlib
+export STRIP=strip
+export OTOOL=otool
+export NM=nm
+
+set -eu -o pipefail
+
+if [ "x$*" = 'x--help' ]
+then
+    cat <<EOF
+Usage:
+
+$0 --help
+  Show this help message and exit.
+
+$0 [ --enable-lcov ] [ MAKEARGS... ]
+  Build Zcash and most of its transitive dependencies from
+  source. MAKEARGS are applied to both dependencies and Zcash itself. If
+  --enable-lcov is passed, Zcash is configured to add coverage
+  instrumentation, thus enabling "make cov" to work.
+EOF
+    exit 0
+fi
+
+# If --enable-lcov is the first argument, enable lcov coverage support:
+LCOV_ARG=''
+HARDENING_ARG='--disable-hardening'
+if [ "x${1:-}" = 'x--enable-lcov' ]
+then
+    LCOV_ARG='--enable-lcov'
+    HARDENING_ARG='--disable-hardening'
+    shift
+fi
+
+TRIPLET=`./depends/config.guess`
+PREFIX="$(pwd)/depends/$TRIPLET"
+
+make "$@" -C ./depends/ V=1 NO_QT=1
+
+./autogen.sh
+CPPFLAGS="-I$PREFIX/include -arch x86_64" LDFLAGS="-L$PREFIX/lib -arch x86_64 -Wl,-no_pie -fopenmp" \
+CXXFLAGS='-arch x86_64 -I/usr/local/Cellar/gcc5/5.4.0/include/c++/5.4.0 -I$PREFIX/include -fwrapv -fno-strict-aliasing -Werror -g -Wl,-undefined -Wl,dynamic_lookup' \
+./configure --prefix="${PREFIX}" --with-gui=no "$HARDENING_ARG" "$LCOV_ARG"
+
+make "$@" V=1 NO_GTEST=1 STATIC=1