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+How to build (wasm)
+===================
+
+For libgpg-error
+----------------
+
+First create `src/syscfg/lock-obj-pub.wasm32-unknown-none.h` with the below:
+
+```
+## lock-obj-pub.wasm32-unknown-emscripten.h
+## File created by gen-posix-lock-obj - DO NOT EDIT
+## To be included by mkheader into gpg-error.h
+
+typedef struct
+{
+  long _vers;
+  union {
+    volatile char _priv[28];
+    long _x_align;
+    long *_xp_align;
+  } u;
+} gpgrt_lock_t;
+
+#define GPGRT_LOCK_INITIALIZER {1,{{0,0,0,0,0,0,0,0, \
+                                    0,0,0,0,0,0,0,0, \
+                                    0,0,0,0,0,0,0,0, \
+                                    0,0,0,0}}}
+##
+## Local Variables:
+## mode: c
+## buffer-read-only: t
+## End:
+##
+```
+
+(source: <https://code.videolan.org/b1ue/vlc/-/blob/81ca8d4f0a86c39f363ad5a07781a3f488a3af64/contrib/src/gpg-error/emscripten.patch>)
+
+Then do:
+
+```
+emconfigure ./configure CFLAGS='-s PURE_WASI=1' --host=wasm32-unknown-none --prefix="$(cd ../buildenv; pwd)" --build=$YOURSYS
+emmake make
+emmake make install
+```
+
+(replace `$YOURSYS` with the system you're building on, e.g. `x86_64-pc-linux-gnu`)
+
+For libgcrypt
+-------------
+
+First do libgpg-error, then just do:
+
+```
+emconfigure ./configure CFLAGS='-s PURE_WASI=1' --host=wasm32-unknown-none --build=$YOURSYS --prefix="$(cd ../buildenv; pwd)" --with-gpg-error-prefix="$(cd ../buildenv; pwd)"
+emmake make
+emmake make install
+```
+
+(replace `$YOURSYS` with the system you're building on, e.g. `x86_64-pc-linux-gnu`)
+
+For libotr
+----------
+
+First do libgcrypt, then just do:
+
+```
+emconfigure ./configure CFLAGS='-s PURE_WASI=1' --host=wasm32-unknown-none --build=$YOURSYS --prefix="$(cd ../buildenv; pwd)" --with-libgcrypt-prefix="$(cd ../buildenv; pwd)" --disable-gcc-hardening
+emmake make
+emmake make install
+```
+
+(replace `$YOURSYS` with the system you're building on, e.g. `x86_64-pc-linux-gnu`)