Don't use @rpath.
https://github.com/P-H-C/phc-winner-argon2/pull/309
--- Makefile.orig	2019-05-20 04:18:00.000000000 -0500
+++ Makefile	2020-12-03 14:31:31.000000000 -0600
@@ -83,7 +83,7 @@
 endif
 ifeq ($(KERNEL_NAME), Darwin)
 	LIB_EXT := $(ABI_VERSION).dylib
-	LIB_CFLAGS := -dynamiclib -install_name @rpath/lib$(LIB_NAME).$(LIB_EXT)
+	LIB_CFLAGS = -dynamiclib -install_name $(PREFIX)/$(LIBRARY_REL)/lib$(LIB_NAME).$(LIB_EXT)
 	LINKED_LIB_EXT := dylib
 	PC_EXTRA_LIBS ?=
 endif
