diff --git a/.gitignore b/.gitignore
old mode 100644
new mode 100755
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..c4d9131
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,14 @@
+Copyright © 2004-2011 by Internet Systems Consortium, Inc. ("ISC")
+Copyright © 2018-2024 by 076.moe
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH REGARD
+TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
diff --git a/Makefile b/Makefile
old mode 100644
new mode 100755
index 7c521c8..77cf452
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,8 @@
 NAME=sxpdf
 VERSION=0.0.1
 # Linux、Haiku、かIllumos = /usr、FreeBSDかOpenBSD = /usr/local、NetBSD = /usr/pkg
-PREFIX=/usr
-CC=gcc
+PREFIX=/usr/local
+CC=cc
 CFLAGS=-Wall $(shell pkg-config --cflags poppler-glib)
 LDFLAGS=-lX11 -lcairo $(shell pkg-config --libs poppler-glib)
 
diff --git a/README.md b/README.md
old mode 100644
new mode 100755
diff --git a/main.c b/main.c
old mode 100644
new mode 100755