diff --git a/Makefile.am b/Makefile.am
index b757857..3f4fccf 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -189,6 +189,7 @@ libpkgconf_la_SOURCES  =	\
 		libpkgconf/tuple.c		\
 		libpkgconf/dependency.c		\
 		libpkgconf/queue.c		\
+		libpkgconf/output.c		\
 		libpkgconf/path.c		\
 		libpkgconf/personality.c	\
 		libpkgconf/parser.c
diff --git a/Makefile.lite b/Makefile.lite
index 4e03ffd..8192170 100644
--- a/Makefile.lite
+++ b/Makefile.lite
@@ -22,6 +22,7 @@ SRCS = \
 	libpkgconf/dependency.c		\
 	libpkgconf/fileio.c		\
 	libpkgconf/fragment.c		\
+	libpkgconf/output.c		\
 	libpkgconf/parser.c		\
 	libpkgconf/path.c		\
 	libpkgconf/personality.c	\
diff --git a/meson.build b/meson.build
index a7e43bf..e654f0a 100644
--- a/meson.build
+++ b/meson.build
@@ -94,6 +94,7 @@ libpkgconf = library('pkgconf',
   'libpkgconf/dependency.c',
   'libpkgconf/fileio.c',
   'libpkgconf/fragment.c',
+  'libpkgconf/output.c',
   'libpkgconf/parser.c',
   'libpkgconf/path.c',
   'libpkgconf/personality.c',