krb5: Fix spack install krb5 ^openssl~shared (#40306)

var/spack/repos/builtin/packages/krb5/package.py

@@ -35,6 +35,7 @@ class Krb5(AutotoolsPackage):
     depends_on("openssl")
     depends_on("gettext")
     depends_on("findutils", type="build")
+    depends_on("pkgconfig", type="build", when="^openssl~shared")
 
     variant(
         "shared", default=True, description="install shared libraries if True, static if false"
@@ -80,6 +81,11 @@ def configure_args(self):
         if "%gcc@10:" in self.spec:
             args.append("CFLAGS=-fcommon")
 
+        if self.spec["openssl"].satisfies("~shared"):
+            pkgconf = which("pkg-config")
+            ssllibs = pkgconf("--static", "--libs", "openssl", output=str)
+            args.append(f"LDFLAGS={ssllibs}")
+
         return args
 
     def flag_handler(self, name, flags):