Link error finding pthread when cross compiling for Raspberry PI using Macos

Im trying to build an application on the mac (host) for the raspberry pi (target) that will use zeromq. I can write a simeple program that uses pthread and it runs perfectly. When I enable -lzmq, linking fails on all of the pthread calls in zeromq. Why is the version of the missing glibc different at each failure? The libc is installed and reports the following version:

ii  libc-bin                             2.36-9+rpt2+deb12u9                 arm64        GNU C Library: Binariesii  libc-dev-bin                         2.36-9+rpt2+deb12u9                 arm64        GNU C Library: Development binariesii  libc-devtools                        2.36-9+rpt2+deb12u9                 arm64        GNU C Library: Development toolsii  libc-l10n                            2.36-9+rpt2+deb12u9                 all          GNU C Library: localization files

The error I receive when linking

/Users/rich/workspace/rpi/sysroot/usr/local/lib/libzmq.so: undefined reference to `__libc_single_threaded@GLIBC_2.32'/Users/rich/workspace/rpi/sysroot/usr/local/lib/libzmq.so: undefined reference to `pthread_sigmask@GLIBC_2.32'/Users/rich/workspace/rpi/sysroot/usr/local/lib/libzmq.so: undefined reference to `pthread_join@GLIBC_2.34'/Users/rich/workspace/rpi/sysroot/usr/local/lib/libzmq.so: undefined reference to `pthread_setname_np@GLIBC_2.34'/Users/rich/workspace/rpi/sysroot/usr/local/lib/libzmq.so: undefined reference to `pthread_mutex_trylock@GLIBC_2.34'/Users/rich/workspace/rpi/sysroot/usr/local/lib/libzmq.so: undefined reference to `stat@GLIBC_2.33'/Users/rich/workspace/rpi/sysroot/usr/local/lib/libzmq.so: undefined reference to `pthread_mutexattr_settype@GLIBC_2.34'/Users/rich/workspace/rpi/sysroot/usr/local/lib/libzmq.so: undefined reference to `pthread_create@GLIBC_2.34'/Users/rich/workspace/rpi/sysroot/usr/local/lib/libzmq.so: undefined reference to `pthread_cond_clockwait@GLIBC_2.34'/Users/rich/workspace/rpi/sysroot/usr/local/lib/libzmq.so: undefined reference to `pthread_mutexattr_destroy@GLIBC_2.34'

Setup:

1. the zmq and czmq libs are built on the raspbery pi
2. the /usr/local and /lib directories where copied to the macos
3. compiler is aarch64-unknown-linux-gnu version 13.3.0 available from homebrew.
4. built with this makefile

Makefile

######################################## target: proto#######################################TARGET = protomq######################################## options#######################################GCC_PATH = CFLAGS = PREFIX = OPT = C_DEFS = CFLAGS = ifeq ($(DEBUG), 1)OPT += -Og -g3C_DEFS +=  -DDEBUG$(info building WITH debugging information)else OPT += -Og -g3$(info building WITHOUT debugging information)endififeq ($(VERBOSE), 1)OPT += -v$(info verbose building)endifGCC_PATH += /opt/homebrew/Cellar/aarch64-unknown-linux-gnu/13.3.0/bin/PREFIX += aarch64-unknown-linux-gnu-######################################## binaries#######################################CC = $(PREFIX)gccCXX = $(PREFIX)g++AS = $(PREFIX)gcc -x assembler-with-cppCP = $(PREFIX)objcopySZ = $(PREFIX)sizeHEX = $(CP) -O ihexBIN = $(CP) -O binary -S######################################## paths#######################################BUILD_DIR = buildSYSROOT =/Users/rich/workspace/rpi/sysroot######################################## compiler flags#######################################CFLAGS += $(OPT) $(C_DEFS) -Wall -Wextra -std=c11 --sysroot=$(SYSROOT) -v -pipe -mlittle-endian -march=armv8-aLDLIBS +=  -L$(SYSROOT)/lib -L$(SYSROOT)/usr/local/libLDFLAGS += -lc -lm -pthread -lrt -ldl -pthread -lzmq####################################### source######################################'C_SOURCES = \$(wildcard *.c) \middleware/tlog/tlog.c \C_INCLUDES =  \-I. \-Imiddleware/tlog/ \-I$(SYSROOT)/usr/include \-I$(SYSROOT)/usr/include/aarch64-linux-gnu \-I$(SYSROOT)/usr/local/include \C_DEFS += \# Create the build directory if it doesn't exist$(BUILD_DIR):    mkdir -p $(BUILD_DIR) # Create the necessary subdirectories in the build directory$(BUILD_DIR)/%.o: %.c    mkdir -p $(dir $@)    $(CC) -c $(CFLAGS) $(C_INCLUDES) -c $< -o $@# Compile the C source files into object files in the build directory$(BUILD_DIR)/%.o: %.c | $(BUILD_DIR)    $(CC) -c $(CFLAGS) $(C_INCLUDES) -c $< -o $@# List of object filesC_OBJECTS = $(C_SOURCES:%.c=$(BUILD_DIR)/%.o)CPP_OBJECTS = $(CPP_SOURCES:%.cpp=$(BUILD_DIR)/%.o)OBJECTS = $(C_OBJECTS)####################################### build######################################buildnumber: buildnumber.h.stampbuildnumber.h.stamp: $(C_SOURCES)    buildnumber --file buildnumber.h    touch buildnumber.h.stampall: $(TARGET) $(TARGET): $(OBJECTS) buildnumber.h.stamp    $(CC) $(LDFLAGS) $(OBJECTS) -o $@ $(LDLIBS)clean:     rm -rf $(TARGET) $(BUILD_DIR)/*.o  buildnumber.h.stamp

tried varrious link flags but nothing helped