Set PKG_CONFIG_PATH

Change-Id: Ie9be061c8fe3e1be9944777e1d2767432476838a

python/cmake_modules/FindArrow.cmake

@@ -75,7 +75,7 @@ find_library(ARROW_PYTHON_LIB_PATH NAMES arrow_python
   ${ARROW_SEARCH_LIB_PATH}
   NO_DEFAULT_PATH)
 
-if (ARROW_INCLUDE_DIR AND ARROW_LIB_PATH)
+if (ARROW_INCLUDE_DIR AND ARROW_LIBS)
   set(ARROW_FOUND TRUE)
   set(ARROW_LIB_NAME libarrow)
   set(ARROW_IO_LIB_NAME libarrow_io)

python/manylinux1/build_arrow.sh

@@ -39,6 +39,7 @@ export PYARROW_BUNDLE_ARROW_CPP=1
 export LDFLAGS="-Wl,--no-as-needed"
 export ARROW_HOME="/arrow-dist"
 export PARQUET_HOME="/usr"
+export PKG_CONFIG_PATH=/arrow-dist/lib64/pkgconfig
 
 # Ensure the target directory exists
 mkdir -p /io/dist