diff --git a/egui-winit/Cargo.toml b/egui-winit/Cargo.toml
index 1db5818b..b64a630b 100644
--- a/egui-winit/Cargo.toml
+++ b/egui-winit/Cargo.toml
@@ -48,7 +48,7 @@ links = ["webbrowser"]
 # experimental support for a screen reader
 screen_reader = ["tts"]
 
-persistence = ["egui/serialize", "serde"]
+persistence = ["egui/serialize", "serde"] # can't add epi/persistence here because of https://github.com/rust-lang/cargo/issues/8832
 serialize = ["egui/serialize", "serde"]
 
 # implement bytemuck on most types.
diff --git a/egui_glow/Cargo.toml b/egui_glow/Cargo.toml
index 429818a2..1a519545 100644
--- a/egui_glow/Cargo.toml
+++ b/egui_glow/Cargo.toml
@@ -58,7 +58,7 @@ default_fonts = ["egui/default_fonts"]
 # enable opening links in a browser when an egui hyperlink is clicked.
 links = ["egui-winit/links"]
 
-# enable code for sabing
+# enable code for saving state
 persistence = [
   "egui-winit/persistence",
   "egui/persistence",
@@ -71,6 +71,5 @@ persistence = [
 screen_reader = ["egui-winit/screen_reader"]
 
 # enable glutin/winit integration.
-# if you want to use glow painter on web disable it.
-# if disabled reduce crate size and build time.
+# if you want to use glow painter on web disable this feature.
 winit = ["egui-winit", "glutin"]
diff --git a/epaint/Cargo.toml b/epaint/Cargo.toml
index debfc233..eeadaad9 100644
--- a/epaint/Cargo.toml
+++ b/epaint/Cargo.toml
@@ -35,7 +35,7 @@ bytemuck = { version = "1.7.2", features = ["derive"], optional = true }
 cint = { version = "^0.2.2", optional = true }
 nohash-hasher = "0.2"
 parking_lot = { version = "0.11", optional = true } # Using parking_lot over std::sync::Mutex gives 50% speedups in some real-world scenarios.
-serde = { version = "1", features = ["derive"], optional = true }
+serde = { version = "1", features = ["derive", "rc"], optional = true }
 
 [features]
 default = ["default_fonts", "multi_threaded"]
diff --git a/epi/Cargo.toml b/epi/Cargo.toml
index 74fe92f4..48f9f8cc 100644
--- a/epi/Cargo.toml
+++ b/epi/Cargo.toml
@@ -33,4 +33,4 @@ serde = { version = "1", optional = true }
 [features]
 default = []
 file_storage = ["directories-next", "ron", "serde"]
-persistence = ["ron", "serde"]
+persistence = ["ron", "serde", "egui/persistence"]
diff --git a/sh/build_demo_web.sh b/sh/build_demo_web.sh
index cbbd88e0..27de09de 100755
--- a/sh/build_demo_web.sh
+++ b/sh/build_demo_web.sh
@@ -42,13 +42,14 @@ rm -f docs/${CRATE_NAME}_bg.wasm
 echo "Building rust…"
 BUILD=release
 
-cargo build \
-  -p ${CRATE_NAME} \
-  --release \
-  --lib \
-  --target wasm32-unknown-unknown \
-  --no-default-features \
-  --features ${FEATURES}
+(cd $CRATE_NAME &&
+  cargo build \
+    --release \
+    --lib \
+    --target wasm32-unknown-unknown \
+    --no-default-features \
+    --features ${FEATURES}
+)
 
 # Get the output directory (in the workspace it is in another location)
 TARGET=`cargo metadata --format-version=1 | jq --raw-output .target_directory`
diff --git a/sh/check.sh b/sh/check.sh
index d35ca35c..37ec1c06 100755
--- a/sh/check.sh
+++ b/sh/check.sh
@@ -33,6 +33,18 @@ cargo doc --document-private-items --no-deps --all-features
 (cd egui_glium && cargo check --no-default-features)
 (cd egui_glow && cargo check --no-default-features)
 
+
+(cd eframe && cargo check --all-features)
+(cd egui && cargo check --all-features)
+(cd egui_glium && cargo check --all-features)
+(cd egui_glow && cargo check --all-features)
+(cd egui_web && cargo check --all-features)
+# (cd egui-winit && cargo check --all-features) can't do, beacause of https://github.com/rust-lang/cargo/issues/8832
+(cd emath && cargo check --all-features)
+(cd epaint && cargo check --all-features)
+(cd epi && cargo check --all-features)
+
+
 # ------------------------------------------------------------
 #