We don't want libxcrypt being detected automagically.
Reverting upstream stupidity.

--- whois-5.5.6/Makefile
+++ whois-5.5.6/Makefile
@@ -55,12 +55,9 @@
 DEFS += -DHAVE_ICONV
 endif
 
-ifeq ($(shell $(PKG_CONFIG) --exists 'libxcrypt >= 4.1' || echo NO),)
+ifdef HAVE_XCRYPT
 DEFS += -DHAVE_CRYPT_H -DHAVE_LINUX_CRYPT_GENSALT $(shell $(PKG_CONFIG) --cflags libcrypt)
 mkpasswd_LDADD += $(shell $(PKG_CONFIG) --libs libcrypt)
-else ifdef HAVE_XCRYPT
-DEFS += -DHAVE_XCRYPT_H -DHAVE_LINUX_CRYPT_GENSALT
-mkpasswd_LDADD += -lxcrypt
 else ifdef HAVE_LIBOWCRYPT
 # owl and openSUSE have crypt_gensalt(3) in libowcrypt
 DEFS += -DHAVE_CRYPT_H -DHAVE_LINUX_CRYPT_GENSALT -D_OW_SOURCE