--- 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:      ${ASCIIDOC_TOOL}
 	backtrace support:  ${enable_backtrace}
-	btrfs-convert:      ${enable_convert} ${convertfs:+($convertfs)}
+	btrfs-convert:      ${enable_convert}${convertfs:+ ($convertfs)}
 	btrfs-restore zstd: ${enable_zstd}
 	Python bindings:    ${enable_python}
 	Python interpreter: ${PYTHON}