diff --git a/changelog.d/system-cflags.fix b/changelog.d/system-cflags.fix
new file mode 100644
index 000000000..84de5ad57
--- /dev/null
+++ b/changelog.d/system-cflags.fix
@@ -0,0 +1 @@
+- Fix eblurhash and elixir-captcha not using system cflags
diff --git a/mix.exs b/mix.exs
index 4fd2df2d0..313d86b9c 100644
--- a/mix.exs
+++ b/mix.exs
@@ -187,10 +187,12 @@ defp deps do
        ref: "b647d0deecaa3acb140854fe4bda5b7e1dc6d1c8"},
       {:captcha,
        git: "https://git.pleroma.social/pleroma/elixir-libraries/elixir-captcha.git",
-       ref: "e0f16822d578866e186a0974d65ad58cddc1e2ab"},
+       ref: "90f6ce7672f70f56708792a98d98bd05176c9176"},
       {:restarter, path: "./restarter"},
       {:majic, "~> 1.0"},
-      {:eblurhash, "~> 1.2.2"},
+      {:eblurhash,
+       git: "https://github.com/zotonic/eblurhash.git",
+       ref: "bc37ceb426ef021ee9927fb249bb93f7059194ab"},
       {:open_api_spex, "~> 3.16"},
       {:ecto_psql_extras, "~> 0.6"},
 
diff --git a/mix.lock b/mix.lock
index 7922a8eb1..442a2a2f1 100644
--- a/mix.lock
+++ b/mix.lock
@@ -7,7 +7,7 @@
   "bunt": {:hex, :bunt, "0.2.1", "e2d4792f7bc0ced7583ab54922808919518d0e57ee162901a16a1b6664ef3b14", [:mix], [], "hexpm", "a330bfb4245239787b15005e66ae6845c9cd524a288f0d141c148b02603777a5"},
   "cachex": {:hex, :cachex, "3.6.0", "14a1bfbeee060dd9bec25a5b6f4e4691e3670ebda28c8ba2884b12fe30b36bf8", [:mix], [{:eternal, "~> 1.2", [hex: :eternal, repo: "hexpm", optional: false]}, {:jumper, "~> 1.0", [hex: :jumper, repo: "hexpm", optional: false]}, {:sleeplocks, "~> 1.1", [hex: :sleeplocks, repo: "hexpm", optional: false]}, {:unsafe, "~> 1.0", [hex: :unsafe, repo: "hexpm", optional: false]}], "hexpm", "ebf24e373883bc8e0c8d894a63bbe102ae13d918f790121f5cfe6e485cc8e2e2"},
   "calendar": {:hex, :calendar, "1.0.0", "f52073a708528482ec33d0a171954ca610fe2bd28f1e871f247dc7f1565fa807", [:mix], [{:tzdata, "~> 0.5.20 or ~> 0.1.201603 or ~> 1.0", [hex: :tzdata, repo: "hexpm", optional: false]}], "hexpm", "990e9581920c82912a5ee50e62ff5ef96da6b15949a2ee4734f935fdef0f0a6f"},
-  "captcha": {:git, "https://git.pleroma.social/pleroma/elixir-libraries/elixir-captcha.git", "e0f16822d578866e186a0974d65ad58cddc1e2ab", [ref: "e0f16822d578866e186a0974d65ad58cddc1e2ab"]},
+  "captcha": {:git, "https://git.pleroma.social/pleroma/elixir-libraries/elixir-captcha.git", "90f6ce7672f70f56708792a98d98bd05176c9176", [ref: "90f6ce7672f70f56708792a98d98bd05176c9176"]},
   "castore": {:hex, :castore, "0.1.22", "4127549e411bedd012ca3a308dede574f43819fe9394254ca55ab4895abfa1a2", [:mix], [], "hexpm", "c17576df47eb5aa1ee40cc4134316a99f5cad3e215d5c77b8dd3cfef12a22cac"},
   "certifi": {:hex, :certifi, "2.9.0", "6f2a475689dd47f19fb74334859d460a2dc4e3252a3324bd2111b8f0429e7e21", [:rebar3], [], "hexpm", "266da46bdb06d6c6d35fde799bcb28d36d985d424ad7c08b5bb48f5b5cdd4641"},
   "combine": {:hex, :combine, "0.10.0", "eff8224eeb56498a2af13011d142c5e7997a80c8f5b97c499f84c841032e429f", [:mix], [], "hexpm", "1b1dbc1790073076580d0d1d64e42eae2366583e7aecd455d1215b0d16f2451b"},
@@ -27,7 +27,7 @@
   "deep_merge": {:hex, :deep_merge, "1.0.0", "b4aa1a0d1acac393bdf38b2291af38cb1d4a52806cf7a4906f718e1feb5ee961", [:mix], [], "hexpm", "ce708e5f094b9cd4e8f2be4f00d2f4250c4095be93f8cd6d018c753894885430"},
   "earmark": {:hex, :earmark, "1.4.22", "ea3e45c6359446dc308be0a64ce82a03260d973de7d0625a762e6d352ff57958", [:mix], [{:earmark_parser, "~> 1.4.23", [hex: :earmark_parser, repo: "hexpm", optional: false]}], "hexpm", "1caf5145665a42fd76d5317286b0c171861fb1c04f86ab103dde76868814fdfb"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.32", "fa739a0ecfa34493de19426681b23f6814573faee95dfd4b4aafe15a7b5b32c6", [:mix], [], "hexpm", "b8b0dd77d60373e77a3d7e8afa598f325e49e8663a51bcc2b88ef41838cca755"},
-  "eblurhash": {:hex, :eblurhash, "1.2.2", "7da4255aaea984b31bb71155f673257353b0e0554d0d30dcf859547e74602582", [:rebar3], [], "hexpm", "8c20ca00904de023a835a9dcb7b7762fed32264c85a80c3cafa85288e405044c"},
+  "eblurhash": {:git, "https://github.com/zotonic/eblurhash.git", "bc37ceb426ef021ee9927fb249bb93f7059194ab", [ref: "bc37ceb426ef021ee9927fb249bb93f7059194ab"]},
   "ecto": {:hex, :ecto, "3.10.3", "eb2ae2eecd210b4eb8bece1217b297ad4ff824b4384c0e3fdd28aaf96edd6135", [:mix], [{:decimal, "~> 1.6 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "44bec74e2364d491d70f7e42cd0d690922659d329f6465e89feb8a34e8cd3433"},
   "ecto_enum": {:hex, :ecto_enum, "1.4.0", "d14b00e04b974afc69c251632d1e49594d899067ee2b376277efd8233027aec8", [:mix], [{:ecto, ">= 3.0.0", [hex: :ecto, repo: "hexpm", optional: false]}, {:ecto_sql, "> 3.0.0", [hex: :ecto_sql, repo: "hexpm", optional: false]}, {:mariaex, ">= 0.0.0", [hex: :mariaex, repo: "hexpm", optional: true]}, {:postgrex, ">= 0.0.0", [hex: :postgrex, repo: "hexpm", optional: true]}], "hexpm", "8fb55c087181c2b15eee406519dc22578fa60dd82c088be376d0010172764ee4"},
   "ecto_psql_extras": {:hex, :ecto_psql_extras, "0.7.14", "7a20cfe913b0476542b43870e67386461258734896035e3f284039fd18bd4c4c", [:mix], [{:ecto_sql, "~> 3.7", [hex: :ecto_sql, repo: "hexpm", optional: false]}, {:postgrex, "~> 0.16.0 or ~> 0.17.0", [hex: :postgrex, repo: "hexpm", optional: false]}, {:table_rex, "~> 3.1.1", [hex: :table_rex, repo: "hexpm", optional: false]}], "hexpm", "22f5f98592dd597db9416fcef00effae0787669fdcb6faf447e982b553798e98"},