README.md: fix typo in macOS instructions

diff --git a/README.md b/README.md
index 869ed56134be54942789cec007809c60ff75e148..40d4171479a586a09f31aa11183571f7290f59b0 100644 (file)
--- a/README.md
+++ b/README.md
@@ -211,7 +211,7 @@ brew install boost lua pkg-config ragel openssl
 make -j4
 ```
 
-Additionally, for PostgreSQL support, run `brew install postgresql` and add `--with-modules="gpsql"` to `./configure`.
+Additionally, for PostgreSQL support, run `brew install postgresql` and add `--with-modules="gpgsql"` to `./configure`.
 For MySQL support, run `brew install mariadb` and add `--with-modules="gmysql"` to `./configure`.
 
 Linux notes