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if (APPLE OR CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
set(SYS_RND_HDR "")
else ()
find_path(SYS_RND_HDR sys/random.h PATH /usr/include/ /usr/local/include/)
if (SYS_RND_HDR)
message(STATUS "Found sys/random.h in ${SYS_RND_HDR}")
set(HAVE_SYS_RANDOM TRUE)
else ()
set(SYS_RND_HDR "")
unset(HAVE_SYS_RANDOM)
endif ()
endif()
# Validate that at least one secure random generator is available
if (NOT ((CMAKE_SYSTEM_NAME STREQUAL "FreeBSD") OR APPLE OR
HAVE_SYS_RANDOM OR HAVE_OPENSSL_RNG OR HAVE_LIBGCRYPT))
message(FATAL_ERROR "No secure random generator found, "
"please install libgcrypt (> 1.7.0) or OpenSSL")
endif ()
mark_as_advanced(SYS_RND_HDR)
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