docker pull immortalwrt/opde:sdk
docker run -it --rm immortalwrt/opde:sdk zsh # or bash
export http_proxy= # [your proxy], do not use localhost or 127.0.0.1
export https_proxy=$http_proxy
opde feeds && opde config -a
make package/feeds/packages/exim/compile -j$(nproc) || make package/feeds/packages/exim/compile V=s

Applying ./patches/010-allow-json-dynamic-lookup.patch using plaintext: 
patching file src/drtables.c

Applying ./patches/030-openssl-deprecated.patch using plaintext: 
patching file src/dane-openssl.c
patching file src/pdkim/signing.c
patching file src/tls-openssl.c
patching file src/tlscert-openssl.c

Applying ./patches/100-localscan_dlopen.patch using plaintext: 
patching file src/config.h.defaults
patching file src/EDITME
patching file src/globals.c
patching file src/globals.h
patching file src/local_scan.c
patching file src/readconf.c
make[4]: Entering directory '/openwrt/build_dir/target-aarch64_cortex-a72_musl/exim-ldap/exim-4.94.2'

>>> Creating links to source files...
>>> Creating lookups/Makefile for building dynamic modules
>>> New Makefile & lookups/Makefile installed
>>> Use "make makefile" if you need to force rebuilding of the makefile
 
make[4]: Leaving directory '/openwrt/build_dir/target-aarch64_cortex-a72_musl/exim-ldap/exim-4.94.2'
make[4]: Entering directory '/openwrt/build_dir/target-aarch64_cortex-a72_musl/exim-ldap/exim-4.94.2/build-Linux-aarch64'
cc buildconfig.c
/bin/sh ../scripts/Configure-config.h "make"
make[5]: Entering directory '/openwrt/build_dir/target-aarch64_cortex-a72_musl/exim-ldap/exim-4.94.2/build-Linux-aarch64'
make[5]: 'buildconfig' is up to date.
make[5]: Leaving directory '/openwrt/build_dir/target-aarch64_cortex-a72_musl/exim-ldap/exim-4.94.2/build-Linux-aarch64'
Building configuration file config.h
>>> config.h built

cc -DMACRO_PREDEF macro_predef.c
cc -DMACRO_PREDEF globals.c
cc -DMACRO_PREDEF readconf.c
cc -DMACRO_PREDEF route.c
cc -DMACRO_PREDEF transport.c
cc -DMACRO_PREDEF drtables.c
cc -DMACRO_PREDEF tls.c
cc -DMACRO_PREDEF transports/appendfile.c
cc -DMACRO_PREDEF transports/autoreply.c
cc -DMACRO_PREDEF transports/lmtp.c
cc -DMACRO_PREDEF transports/pipe.c
cc -DMACRO_PREDEF transports/queuefile.c
cc -DMACRO_PREDEF transports/smtp.c
cc -DMACRO_PREDEF routers/accept.c
cc -DMACRO_PREDEF routers/dnslookup.c
cc -DMACRO_PREDEF routers/ipliteral.c
cc -DMACRO_PREDEF routers/iplookup.c
cc -DMACRO_PREDEF routers/manualroute.c
cc -DMACRO_PREDEF routers/queryprogram.c
cc -DMACRO_PREDEF routers/redirect.c
cc -DMACRO_PREDEF auths/auth-spa.c
cc -DMACRO_PREDEF auths/cram_md5.c
cc -DMACRO_PREDEF auths/cyrus_sasl.c
auths/cyrus_sasl.c:35:10: fatal error: sasl/sasl.h: No such file or directory
   35 | #include <sasl/sasl.h>
      |          ^~~~~~~~~~~~~
compilation terminated.
make[4]: *** [Makefile:341: macro-cyrus_sasl.o] Error 1
make[4]: Leaving directory '/openwrt/build_dir/target-aarch64_cortex-a72_musl/exim-ldap/exim-4.94.2/build-Linux-aarch64'
make[3]: *** [Makefile:357: /openwrt/build_dir/target-aarch64_cortex-a72_musl/exim-ldap/exim-4.94.2/.configured_d92a942a8d749d03d3e878ee19749a25] Error 2