System.Security.Cryptography.Native needs libssl.so and libcrypto.so, both of which are provided by Termux
System.Net.Security.Native needs libgssapi_krb5.so.2
Mono CoreCLR needs to be able to find libraries in "$TERMUX_PREFIX/lib"
This sets rpath to help the linker find them during runtime

--- a/src/runtime/src/native/libs/System.Security.Cryptography.Native/CMakeLists.txt
+++ b/src/runtime/src/native/libs/System.Security.Cryptography.Native/CMakeLists.txt
@@ -4,6 +4,7 @@ cmake_minimum_required(VERSION 3.10..3.20)
 project(System.Security.Cryptography.Native C)

 # These are happening inside of OpenSSL-defined macros out of our control
+add_link_options("-Wl,-rpath,@TERMUX_PREFIX@/lib")
 add_compile_options(-Wno-cast-align)
 add_compile_options(-Wno-reserved-id-macro)
 add_compile_options(-Wno-documentation)
--- a/src/runtime/src/native/libs/System.Net.Security.Native/CMakeLists.txt
+++ b/src/runtime/src/native/libs/System.Net.Security.Native/CMakeLists.txt
@@ -1,5 +1,6 @@
 project(System.Net.Security.Native C)
 
+add_link_options("-Wl,-rpath,@TERMUX_PREFIX@/lib")
 add_compile_options(-Wno-incompatible-pointer-types-discards-qualifiers)
 
 include(${CMAKE_CURRENT_LIST_DIR}/extra_libs.cmake)
--- a/src/runtime/src/mono/mono/mini/CMakeLists.txt
+++ b/src/runtime/src/mono/mono/mini/CMakeLists.txt
@@ -1,4 +1,5 @@
 project(mini C)
+add_link_options("-Wl,-rpath,@TERMUX_PREFIX@/lib")
 
 if(ENABLE_LLVM OR ENABLE_LLVM_RUNTIME OR HOST_BROWSER)
   enable_language(CXX)