diff --git a/.ccls b/.ccls
new file mode 100644
index 0000000..7b5bd08
--- /dev/null
+++ b/.ccls
@@ -0,0 +1,5 @@
+gcc
+-Wall
+-Wextra
+-Werror=implicit
+-Ilib/inc
diff --git a/.gitignore b/.gitignore
index 4c7473d..bfd6821 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /bin
 /obj
+.ccls-cache