--- btrfs-progs-v4.17/configure.ac.orig	2018-06-15 16:21:17.000000000 +0200
+++ btrfs-progs-v4.17/configure.ac	2018-07-18 20:17:29.626713519 +0200
@@ -280,7 +280,7 @@
 	documentation:      ${enable_documentation}
 	doc generator:      ${DOC_TOOL}
 	backtrace support:  ${enable_backtrace}
-	btrfs-convert:      ${enable_convert} ${convertfs:+($convertfs)}
+	btrfs-convert:      ${enable_convert}${convertfs:+ ($convertfs)}
 	zstd support:       ${enable_zstd}
 	lzo support:        ${enable_lzo}
 	fsverity support:   ${have_fsverity}