diff --git a/README.md b/README.md
index c23f31c..c25f4fc 100644
--- a/README.md
+++ b/README.md
@@ -9,13 +9,14 @@ See manpage calcelestial(1) and the [blog entry](https://www.noteblok.net/2012/1
 ### Linux
 
 ```
-sudo apt-get install -y libnova-dev libcurl4-openssl-dev libjson-c-dev libdb-dev autoconf make gcc
+sudo apt-get install -y libnova-dev libcurl4-openssl-dev libjson-c-dev libdb-dev autoconf make gcc pkg-config
 autoreconf -i && ./configure && make install
-````
+```
+
 ### macOS
 
 ```
-brew install curl json-c berkeley-db
+brew install curl json-c berkeley-db pkg-config
 git clone git://git.code.sf.net/p/libnova/libnova libnova && pushd libnova && autoreconf -if && ./configure && make && sudo make install; popd
 autoreconf -i && ./configure && make install
 ```