--- a/configure.ac
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+++ b/configure.ac
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@@ -38,6 +38,7 @@ LT_INIT()
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# Checks for programs.
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AC_PROG_CC
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+AC_PROG_CPP
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AC_PROG_INSTALL
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AC_PROG_SED
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AC_PROG_YACC
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@@ -182,6 +183,7 @@ fi
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AC_SUBST(LIBPTHREAD, $LIBPTHREAD)
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# Checks for header files.
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AC_CHECK_HEADERS([limits.h stdlib.h string.h])
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+AC_CHECK_HEADERS([inttypes.h stdint.h])
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AC_CHECK_HEADERS([fcntl.h sys/ioctl.h sys/time.h termios.h unistd.h])
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AC_CHECK_HEADERS([ddk/hidsdi.h],,,[#include <windows.h>
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#include <setupapi.h>])
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