-AC_CHECK_LIB(pcre, pcre_compile, [AC_CHECK_HEADER(pcre.h, [AC_EGREP_HEADER(pcre_fullinfo, pcre.h, [have_pcre=yes], [AC_MSG_WARN([[pcre old version installed]]); have_pcre=no])], [have_pcre=no])], [have_pcre=no])
-AC_CHECK_LIB(pcreposix, regcomp, [AC_CHECK_HEADER(pcreposix.h, [AC_EGREP_HEADER(pcreposix_regerror, pcreposix.h, [AC_MSG_WARN([[pcreposix old version installed]]); have_pcreposix=no], [have_pcreposix=yes])], [have_pcreposix=no])], [have_pcreposix=no], -lpcre)
-AC_CHECK_LIB(pcrs, pcrs_compile, [AC_CHECK_HEADER(pcrs.h, [have_pcrs=yes], [have_pcrs=no])], [have_pcrs=no])
-
+AC_CHECK_LIB(pcre, pcre_compile, [
+ AC_CHECK_HEADER(pcre.h, [
+ AC_EGREP_HEADER(pcre_fullinfo, pcre.h, [have_pcre=yes], [AC_MSG_WARN([[pcre old version installed]]); have_pcre=no])
+ ], [
+ AC_CHECK_HEADER(pcre/pcre.h, [
+ AC_EGREP_HEADER(pcre_fullinfo, pcre/pcre.h, [have_pcre=yes]; [AC_DEFINE(PCRE_H_IN_SUBDIR)], [AC_MSG_WARN([[pcre old version installed]]); have_pcre=no])
+ ], [have_pcre=no])
+ ])
+], [have_pcre=no])
+
+AC_CHECK_LIB(pcreposix, regcomp, [
+ AC_CHECK_HEADER(pcreposix.h, [
+ AC_EGREP_HEADER(pcreposix_regerror, pcreposix.h, [AC_MSG_WARN([[pcreposix old version installed]]); have_pcreposix=no], [have_pcreposix=yes])
+ ], [
+ AC_CHECK_HEADER(pcre/pcreposix.h, [
+ AC_EGREP_HEADER(pcreposix_regerror, pcre/pcreposix.h, [AC_MSG_WARN([[pcreposix old version installed]]); have_pcreposix=no], [have_pcreposix=yes]; [AC_DEFINE(PCREPOSIX_H_IN_SUBDIR)])
+ ], [have_pcreposix=no])
+ ])
+], [have_pcreposix=no], -lpcre)
+
+AC_CHECK_LIB(pcrs, pcrs_compile, [AC_CHECK_HEADER(pcrs.h, [have_pcrs=yes], [have_pcrs=no])], [have_pcrs=no], -lpcre)