diff --git a/build.rs b/build.rs
index 01b94116393cefa53bc41f72bf2c3c8c8c8b378f..9c04e9429c5e1ffef9dc12a18d289e164b15dcf4 100644
--- a/build.rs
+++ b/build.rs
@@ -39,6 +39,16 @@ fn main() -> Result<(), std::io::Error> {
     // This is set to allow the use of the library from the build
     // directory.
     let content = String::from_utf8(content).unwrap()
+        .replace("REQUIRES",
+                 if cfg!(feature = "crypto-botan") {
+                     "botan-2"
+                 } else if cfg!(feature = "crypto-nettle") {
+                     "nettle"
+                 } else if cfg!(feature = "crypto-cng") {
+                     ""
+                 } else {
+                     panic!("Don't know dependencies to add to .pc file")
+                 })
         .replace("LIBDIR",
                  &build_dir
                      .to_str()
diff --git a/pep_engine_sequoia_backend.pc.in b/pep_engine_sequoia_backend.pc.in
index de8cd24598638a28f26d0af5e872e81249abc241..8c7cd273fc27c17a746cf5ca1eff491641f11e62 100644
--- a/pep_engine_sequoia_backend.pc.in
+++ b/pep_engine_sequoia_backend.pc.in
@@ -5,6 +5,6 @@ Name: pEpEngineSequoiaBackend
 Description: An implementation of the pEp Engine's crypttext interface using Sequoia
 URL: https://sequoia-pgp.org/
 Version: VERSION
-Requires: botan-2
+Requires: REQUIRES
 Cflags:
 Libs: -L${libdir} -lpep_engine_sequoia_backend