Use <utmpx.h> for struct utmp definiton

.travis/install

@@ -8,7 +8,7 @@ chmod a+x /tmp/apk.static
 
 mkdir -p "$NEWROOT"/etc/apk/keys
 cp "$CLONE_DIR"/.travis/*.pub "$NEWROOT"/etc/apk/keys/
-/tmp/apk.static -X "https://distfiles.adelielinux.org/adelie/current/system" --root "$NEWROOT" --initdb --no-progress add adelie-core bash-binsh musl-dev gcc binutils make
+/tmp/apk.static -X "https://distfiles.adelielinux.org/adelie/current/system" --root "$NEWROOT" --initdb --no-progress add adelie-core bash-binsh musl-dev gcc binutils make pkgconf utmps-dev
 
 cd "$NEWROOT"
 

libgcompat/utmp.c

 #include <stddef.h> /* NULL */
-#include <utmp.h>   /* struct utmp */
+#include <utmpx.h>   /* struct utmp */
 
 /**
  * Get user accounting database entries.