--- configure.ac.orig	2022-07-05 09:38:08 UTC
+++ configure.ac
@@ -91,10 +91,9 @@ fi
 ])
 
 if test $backend = freebsd; then
-AC_SUBST(CPPFLAGS, "$CPPFLAGS -I${prefix}/include/libepoll-shim")
-AC_SUBST(LDFLAGS, "$LDFLAGS -L${prefix}/lib")
-AC_CHECK_HEADERS([sys/epoll.h],[],[AC_MSG_ERROR([Missing libepoll-shim])])
-AC_CHECK_LIB(epoll-shim, epoll_create1)
+PKG_CHECK_MODULES([EPOLLSHIM], [epoll-shim-interpose])
+AC_SUBST(CPPFLAGS, "$CPPFLAGS $EPOLLSHIM_CFLAGS")
+AC_SUBST(LDFLAGS, "$LDFLAGS $EPOLLSHIM_LIBS")
 AC_SUBST(CPPFLAGS, "$CPPFLAGS -DDEFAULT_RSHIM_CONFIG_FILE='\"${prefix}/etc/rshim.conf\"'")
 else
 AC_SUBST(CPPFLAGS, "$CPPFLAGS -DDEFAULT_RSHIM_CONFIG_FILE='\"/etc/rshim.conf\"'")