build-sys: fix += vs = in Makefile

diff --git a/Makefile.am b/Makefile.am
index 0004929cdc623ddc8c87954555648a02a79b88f0..196efe10b87fad9d5951099d478addeab0ab805c 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -2995,7 +2995,7 @@ libsystemd_journal_la_CFLAGS += \
 libsystemd_journal_la_LIBADD += \
        $(XZ_LIBS)
 
-libsystemd_journal_internal_la_CFLAGS = \
+libsystemd_journal_internal_la_CFLAGS += \
        $(XZ_CFLAGS)
 
 libsystemd_journal_internal_la_LIBADD += \