If CC supports the "-print-multi-os-directory" option, use it to determine
where to check for the existence libcrypt.  If it doesn't, then we get /usr/lib.

--- ppp-2.4.3/pppd/Makefile.linux	2004-11-22 14:43:58.522728670 +0000
+++ ppp-2.4.3/pppd/Makefile.linux	2004-11-22 14:47:09.054728322 +0000
@@ -8,6 +8,7 @@
 BINDIR = $(DESTDIR)/sbin
 MANDIR = $(DESTDIR)/share/man/man8
 INCDIR = $(DESTDIR)/include
+LIBDIR = $(DESTDIR)/usr/lib/$(shell gcc -print-multi-os-directory 2> /dev/null)
 
 TARGETS = pppd
 
@@ -32,7 +33,7 @@
 
 CC = gcc
 #
-COPTS = -Wall $(RPM_OPT_FLAGS)
+COPTS = -Wall $(RPM_OPT_FLAGS) -DLIBDIR=\""$(LIBDIR)"\"
 LIBS = -lutil
 
 # Uncomment the next 2 lines to include support for Microsoft's
@@ -120,7 +121,7 @@
 ifneq ($(wildcard /usr/include/crypt.h),)
 CFLAGS   += -DHAVE_CRYPT_H=1
 endif
-ifneq ($(wildcard /usr/lib/libcrypt.*),)
+ifneq ($(wildcard $(LIBDIR)/libcrypt.*),)
 LIBS	+= -lcrypt
 endif
 
--- ppp-2.4.3/pppd/plugins/Makefile.linux	2004-11-22 14:43:58.528727189 +0000
+++ ppp-2.4.3/pppd/plugins/Makefile.linux	2004-11-22 14:54:10.108012609 +0000
@@ -7,7 +7,7 @@
 DESTDIR = @DESTDIR@
 BINDIR = $(DESTDIR)/sbin
 MANDIR = $(DESTDIR)/share/man/man8
-LIBDIR = $(DESTDIR)/lib/pppd/$(VERSION)
+LIBDIR = $(DESTDIR)/lib/$(shell $(CC) -print-multi-os-directory 2> /dev/null)/pppd/$(VERSION)
 
 SUBDIRS := rp-pppoe pppoatm radius
 # Uncomment the next line to include the radius authentication plugin
If CC supports the "-print-multi-os-directory" option, use it to determine
where to check for the existence libcrypt.  If it doesn't, then we get /usr/lib.

--- ppp-2.4.3/pppd/pathnames.h	2004-03-10 18:52:15.000000000 -0500
+++ ppp-2.4.3/pppd/pathnames.h	2004-03-10 18:52:10.000000000 -0500
@@ -55,5 +55,5 @@
 #endif /* __STDC__ */
 
 #ifdef PLUGIN
-#define _PATH_PLUGIN	"/usr/lib/pppd/" VERSION
+#define _PATH_PLUGIN	LIBDIR "/pppd/" VERSION
 #endif /* PLUGIN */