diff --git a/src/libexpr/primops/fetchGit.cc b/src/libexpr/primops/fetchGit.cc
index 90f600284..ca5af7492 100644
--- a/src/libexpr/primops/fetchGit.cc
+++ b/src/libexpr/primops/fetchGit.cc
@@ -6,6 +6,7 @@
 #include "hash.hh"
 
 #include <sys/time.h>
+#include <sys/wait.h>
 
 #include <regex>
 
@@ -173,7 +174,7 @@ GitInfo exportGit(ref<Store> store, const std::string & uri,
     Path tmpDir = createTempDir();
     AutoDelete delTmpDir(tmpDir, true);
 
-    runProgram("tar", true, { "x", "-C", tmpDir }, tar);
+    runProgram("tar", true, { "-x", "-f", "-", "-C", tmpDir }, tar);
 
     gitInfo.storePath = store->addToStore(name, tmpDir);
 
diff --git a/src/nix-daemon/nix-daemon.cc b/src/nix-daemon/nix-daemon.cc
index 7a5cb9a37..87ad4e949 100644
--- a/src/nix-daemon/nix-daemon.cc
+++ b/src/nix-daemon/nix-daemon.cc
@@ -901,7 +901,11 @@ static PeerInfo getPeerInfo(int remote)
 
 #if defined(SO_PEERCRED)
 
+#if defined(__OpenBSD__)
+    struct sockpeercred cred;
+#else
     ucred cred;
+#endif
     socklen_t credLen = sizeof(cred);
     if (getsockopt(remote, SOL_SOCKET, SO_PEERCRED, &cred, &credLen) == -1)
         throw SysError("getting peer credentials");
diff --git a/tests/tarball.sh b/tests/tarball.sh
index ba534c626..b2acb9eb9 100644
--- a/tests/tarball.sh
+++ b/tests/tarball.sh
@@ -11,7 +11,7 @@ cp dependencies.nix $tarroot/default.nix
 cp config.nix dependencies.builder*.sh $tarroot/
 
 tarball=$TEST_ROOT/tarball.tar.xz
-(cd $TEST_ROOT && tar c tarball) | xz > $tarball
+(cd $TEST_ROOT && tar cf - tarball) | xz > $tarball
 
 nix-env -f file://$tarball -qa --out-path | grep -q dependencies