try custom detection

Author: WillAyd

ci/scripts/cpp_build.sh

@@ -43,6 +43,9 @@ if [ ! -z "${CONDA_PREFIX}" ] && [ "${ARROW_EMSCRIPTEN:-OFF}" = "OFF" ]; then
   fi
   export ARROW_CMAKE_ARGS
   export ARROW_GANDIVA_PC_CXX_FLAGS=$(echo | ${CXX} -E -Wp,-v -xc++ - 2>&1 | grep '^ ' | awk '{print "-isystem;" substr($1, 1)}' | tr '\n' ';')
+
+  export LIBRARY_PATH="${CONDA_PREFIX}/lib"
+  export CPLUS_INCLUDE_PATH="${CONDA_PREFIX}/include"
 elif [ -x "$(command -v xcrun)" ]; then
   export ARROW_GANDIVA_PC_CXX_FLAGS="-isysroot;$(xcrun --show-sdk-path)"
 fi

cpp/src/arrow/meson.build

@@ -473,7 +473,22 @@ if needs_json
 endif
 
 if needs_orc
-    orc_dep = dependency('orc')
+    # not all versions of orc installed via conda distribute
+    # cmake/pkgconfig information, so they are undetectable
+    # without custom logic
+    orc_headers = ['orc/orc-config.hh']
+    orc_lib = cpp_compiler.find_library(
+        'orc',
+        has_headers: orc_headers,
+        required: false,
+    )
+
+    if orc_lib.found()
+        orc_dep = declare_dependency(dependencies: orc_lib)
+    else
+        orc_dep = dependency('orc')
+    endif
+
     arrow_components += {
         'arrow_orc': {
             'sources': files(