diff --git a/pkgs/by-name/po/ponyc/disable-networking-tests.patch b/pkgs/by-name/po/ponyc/disable-networking-tests.patch
index b3d83483a5f8..a5f35792ec5a 100644
--- a/pkgs/by-name/po/ponyc/disable-networking-tests.patch
+++ b/pkgs/by-name/po/ponyc/disable-networking-tests.patch
@@ -1,16 +1,42 @@
+From e49f97eb4b0fd27b26437638db7984fbcfd3a14f Mon Sep 17 00:00:00 2001
+From: Morgan Jones <me@numin.it>
+Date: Sun, 4 May 2025 15:46:07 -0700
+Subject: [PATCH] net: disable tests in the Nix sandbox
+
+---
+ packages/net/_test.pony | 19 +------------------
+ 1 file changed, 1 insertion(+), 18 deletions(-)
+
 diff --git a/packages/net/_test.pony b/packages/net/_test.pony
-index 9044dfb1..f0ea10f7 100644
+index 05462eb2..c0c6cdfa 100644
 --- a/packages/net/_test.pony
 +++ b/packages/net/_test.pony
-@@ -26,11 +26,6 @@ actor \nodoc\ Main is TestList
-       test(_TestTCPThrottle)
-     end
+@@ -15,25 +15,8 @@ actor \nodoc\ Main is TestList
+   new make() => None
  
+   fun tag tests(test: PonyTest) =>
+-    // Tests below function across all systems and are listed alphabetically
++    // (@numinit): only this test works in the Nix sandbox:
+     test(_TestTCPConnectionFailed)
+-    test(_TestTCPExpect)
+-    test(_TestTCPExpectOverBufferSize)
+-    test(_TestTCPMute)
+-    test(_TestTCPProxy)
+-    test(_TestTCPUnmute)
+-    test(_TestTCPWritev)
+-
+-    // Tests below exclude windows and are listed alphabetically
+-    ifdef not windows then
+-      test(_TestTCPConnectionToClosedServerFailed)
+-      test(_TestTCPThrottle)
+-    end
+-
 -    // Tests below exclude osx and are listed alphabetically
 -    ifdef not osx then
 -      test(_TestBroadcast)
 -    end
--
+ 
  class \nodoc\ _TestPing is UDPNotify
    let _h: TestHelper
-   let _ip: NetAddress
+-- 
+2.47.0
diff --git a/pkgs/by-name/po/ponyc/disable-process-tests.patch b/pkgs/by-name/po/ponyc/disable-process-tests.patch
new file mode 100644
index 000000000000..e4ee0656655b
--- /dev/null
+++ b/pkgs/by-name/po/ponyc/disable-process-tests.patch
@@ -0,0 +1,26 @@
+From 77d703b11d298f6be88b04f7e8ca85de139e82be Mon Sep 17 00:00:00 2001
+From: Morgan Jones <me@numin.it>
+Date: Mon, 5 May 2025 20:34:02 -0700
+Subject: [PATCH] process: disable KillLongRunningChild test
+
+---
+ packages/process/_test.pony | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/packages/process/_test.pony b/packages/process/_test.pony
+index fe9fdb04..756588f9 100644
+--- a/packages/process/_test.pony
++++ b/packages/process/_test.pony
+@@ -18,7 +18,8 @@ actor \nodoc\ Main is TestList
+     test(_TestChdir)
+     test(_TestExpect)
+     test(_TestFileExecCapabilityIsRequired)
+-    test(_TestKillLongRunningChild)
++    // (@booxter/@numinit) Appears to be flaky.
++    // test(_TestKillLongRunningChild)
+     test(_TestLongRunningChild)
+     test(_TestNonExecutablePathResultsInExecveError)
+     test(_TestPrintvOrdering)
+-- 
+2.47.0
+
diff --git a/pkgs/by-name/po/ponyc/package.nix b/pkgs/by-name/po/ponyc/package.nix
index 77979b862a05..2fcb07cb780b 100644
--- a/pkgs/by-name/po/ponyc/package.nix
+++ b/pkgs/by-name/po/ponyc/package.nix
@@ -19,6 +19,7 @@
   which,
   z3,
   cctools,
+  procps,
 }:
 
 stdenv.mkDerivation (rec {
@@ -73,6 +74,7 @@ stdenv.mkDerivation (rec {
     [
       # Sandbox disallows network access, so disabling problematic networking tests
       ./disable-networking-tests.patch
+      ./disable-process-tests.patch
     ]
     ++ lib.optionals stdenv.hostPlatform.isDarwin [
       (replaceVars ./fix-darwin-build.patch {
@@ -102,10 +104,19 @@ stdenv.mkDerivation (rec {
         --replace-fail "https://github.com/google/googletest/archive/refs/tags/v$googletestRev.tar.gz" "$NIX_BUILD_TOP/deps/googletest-$googletestRev.tar"
   '';
 
-  preBuild = ''
-    make libs build_flags=-j$NIX_BUILD_CORES
-    make configure build_flags=-j$NIX_BUILD_CORES
-  '';
+  preBuild =
+    ''
+      extraFlags=(build_flags=-j$NIX_BUILD_CORES)
+    ''
+    + lib.optionalString stdenv.hostPlatform.isAarch64 ''
+      # See this relnote about building on Raspbian:
+      # https://github.com/ponylang/ponyc/blob/0.46.0/.release-notes/0.45.2.md
+      extraFlags+=(pic_flag=-fPIC)
+    ''
+    + ''
+      make libs "''${extraFlags[@]}"
+      make configure "''${extraFlags[@]}"
+    '';
 
   makeFlags = [
     "PONYC_VERSION=${version}"
@@ -117,8 +128,9 @@ stdenv.mkDerivation (rec {
     "-Wno-error=implicit-fallthrough"
   ];
 
-  # make: *** [Makefile:222: test-full-programs-release] Killed: 9
-  doCheck = !stdenv.hostPlatform.isDarwin;
+  doCheck = true;
+
+  nativeCheckInputs = [ procps ];
 
   installPhase =
     ''