-srp_entry_CFLAGS = @OPENSSL_INCLUDES@ @SRP_CFLAGS@
-srp_entry_LDADD = @SRP_LIBS@ @OPENSSL_LIBS@
-srp_entry_LDFLAGS = @OPENSSL_LDFLAGS@ @SRP_LDFLAGS@
+srp_entry_CPPFLAGS = $(OPENSSL_INCLUDES) $(SRP_CFLAGS)
+srp_entry_LDADD = $(SRP_LIBS) $(OPENSSL_LIBS)
+srp_entry_LDFLAGS = $(OPENSSL_LDFLAGS) $(SRP_LDFLAGS)