Oracle Call Interface

  if test -d "$OCI8_DIR/rdbms/public"; then

    PHP_ADD_INCLUDE($OCI8_DIR/rdbms/public)

    OCI8_INCLUDES="$OCI8_INCLUDES -I$OCI8_DIR/rdbms/public"

  fi

  if test -d "$OCI8_DIR/rdbms/demo"; then

    PHP_ADD_INCLUDE($OCI8_DIR/rdbms/demo)

    OCI8_INCLUDES="$OCI8_INCLUDES -I$OCI8_DIR/rdbms/demo"

  fi

  if test -d "$OCI8_DIR/network/public"; then

    PHP_ADD_INCLUDE($OCI8_DIR/network/public)

    OCI8_INCLUDES="$OCI8_INCLUDES -I$OCI8_DIR/network/public"

  fi

  if test -d "$OCI8_DIR/plsql/public"; then

    PHP_ADD_INCLUDE($OCI8_DIR/plsql/public)

    OCI8_INCLUDES="$OCI8_INCLUDES -I$OCI8_DIR/plsql/public"

  fi
  AC_OCI8_VERSION($OCI8_DIR)

  case $OCI8_VERSION in

    8.0)

      PHP_ADD_LIBRARY_WITH_PATH(nlsrtl3, "", OCI8_SHARED_LIBADD)

      PHP_ADD_LIBRARY_WITH_PATH(core4, "", OCI8_SHARED_LIBADD)

      PHP_ADD_LIBRARY_WITH_PATH(psa, "", OCI8_SHARED_LIBADD)

      PHP_ADD_LIBRARY_WITH_PATH(clntsh, $OCI8_DIR/lib, OCI8_SHARED_LIBADD)

      ;;
    8.1)

      PHP_ADD_LIBRARY(clntsh, 1, OCI8_SHARED_LIBADD)

      PHP_ADD_LIBPATH($OCI8_DIR/lib, OCI8_SHARED_LIBADD)
      dnl 

      dnl OCI_ATTR_STATEMENT is not available in all 8.1.x versions

      dnl 

      PHP_OCI_IF_DEFINED(OCI_ATTR_STATEMENT, [AC_DEFINE(HAVE_OCI8_ATTR_STATEMENT,1,[ ])], $OCI8_INCLUDES)

      ;;
    9.0)

      PHP_ADD_LIBRARY(clntsh, 1, OCI8_SHARED_LIBADD)

      PHP_ADD_LIBPATH($OCI8_DIR/lib, OCI8_SHARED_LIBADD)

      AC_DEFINE(HAVE_OCI8_ATTR_STATEMENT,1,[ ])
      dnl These functions are only available in version >= 9.2

      PHP_CHECK_LIBRARY(clntsh, OCIEnvNlsCreate,

      [

        PHP_CHECK_LIBRARY(clntsh, OCINlsCharSetNameToId,

        [

          AC_DEFINE(HAVE_OCI_9_2,1,[ ])

          OCI8_VERSION=9.2

        ], , [

          -L$OCI8_DIR/lib $OCI8_SHARED_LIBADD

        ])

      ], , [

        -L$OCI8_DIR/lib $OCI8_SHARED_LIBADD

      ])

      ;;
    10.1)

      PHP_ADD_LIBRARY(clntsh, 1, OCI8_SHARED_LIBADD)

      PHP_ADD_LIBPATH($OCI8_DIR/lib, OCI8_SHARED_LIBADD)

      AC_DEFINE(HAVE_OCI8_ATTR_STATEMENT,1,[ ])

      AC_DEFINE(HAVE_OCI_9_2,1,[ ])

      AC_DEFINE(HAVE_OCI8_TEMP_LOB,1,[ ])

      AC_DEFINE(PHP_OCI8_HAVE_COLLECTIONS,1,[ ])

      ;;
    *)

      AC_MSG_ERROR([Unsupported Oracle version])

      ;;

  esac

なるほどね。。。段々と疑問が解けてきた。こういう時、仕組みを知っていると助かる。
でもなぁ。。。ヘッダ・ファイルの置き場くらい統一しとけよな。
特にdemoディレクトリ！そんな場所にoci.hとか置くなよ。紛らわしい名前で腹が立つ。