diff --git a/.ccls b/.ccls
new file mode 100644
index 0000000..28646fc
--- /dev/null
+++ b/.ccls
@@ -0,0 +1,5 @@
+gcc
+%c -std=c99
+%h
+-Iinclude
+-D_GNU_SOURCE
diff --git a/.gitignore b/.gitignore
index 2f7896d..eadc128 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 target/
+.ccls-cache/