diff --git a/Package.swift b/Package.swift
index 04f0df2e..61d98e23 100644
--- a/Package.swift
+++ b/Package.swift
@@ -27,9 +27,18 @@ import PackageDescription
 // To develop this on Apple platforms, set this to true
 let development = false
 
+// Ideally, we should use `.when(platforms:)` to set `swiftSettings` and
+// `dependencies` like on other platforms. However, `Platform.freebsd` is not
+// yet available, and therefore we guard the settings behind this boolean.
+#if os(FreeBSD)
+let isFreeBSD = true
+#else
+let isFreeBSD = false
+#endif
+
 let swiftSettings: [SwiftSetting]
 let dependencies: [Target.Dependency]
-if development {
+if development || isFreeBSD {
     swiftSettings = [
         .define("CRYPTO_IN_SWIFTPM"),
         .define("CRYPTO_IN_SWIFTPM_FORCE_BUILD_API"),
@@ -44,7 +53,7 @@ if development {
         Platform.linux,
         Platform.android,
         Platform.windows,
-        Platform.wasi,
+        Platform.wasi
     ]
     swiftSettings = [
         .define("CRYPTO_IN_SWIFTPM"),
diff --git a/Sources/CCryptoBoringSSL/CMakeLists.txt b/Sources/CCryptoBoringSSL/CMakeLists.txt
index 5b11945c..84ac892f 100644
--- a/Sources/CCryptoBoringSSL/CMakeLists.txt
+++ b/Sources/CCryptoBoringSSL/CMakeLists.txt
@@ -276,7 +276,7 @@ if(CMAKE_SYSTEM_NAME STREQUAL Darwin AND CMAKE_SYSTEM_PROCESSOR MATCHES "amd64|x
     gen/crypto/chacha-x86_64-apple.S
     gen/crypto/chacha20_poly1305_x86_64-apple.S
     gen/crypto/md5-x86_64-apple.S)
-elseif(CMAKE_SYSTEM_NAME MATCHES "Linux|Android" AND CMAKE_SYSTEM_PROCESSOR MATCHES "amd64|x86_64")
+elseif(CMAKE_SYSTEM_NAME MATCHES "Linux|Android|FreeBSD" AND CMAKE_SYSTEM_PROCESSOR MATCHES "amd64|x86_64")
   target_sources(CCryptoBoringSSL PRIVATE
     gen/bcm/aes-gcm-avx10-x86_64-linux.S
     gen/bcm/aesni-gcm-x86_64-linux.S
@@ -313,7 +313,7 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL Darwin AND CMAKE_SYSTEM_PROCESSOR MATCHES "arm
     gen/bcm/vpaes-armv8-apple.S
     gen/crypto/chacha-armv8-apple.S
     gen/crypto/chacha20_poly1305_armv8-apple.S)
-elseif(CMAKE_SYSTEM_NAME MATCHES "Linux|Android" AND CMAKE_SYSTEM_PROCESSOR MATCHES "arm64|aarch64")
+elseif(CMAKE_SYSTEM_NAME MATCHES "Linux|Android|FreeBSD" AND CMAKE_SYSTEM_PROCESSOR MATCHES "arm64|aarch64")
   target_sources(CCryptoBoringSSL PRIVATE
     gen/bcm/aesv8-armv8-linux.S
     gen/bcm/aesv8-gcm-armv8-linux.S
diff --git a/Sources/Crypto/CMakeLists.txt b/Sources/Crypto/CMakeLists.txt
index 95a1c437..3bc8e1bb 100644
--- a/Sources/Crypto/CMakeLists.txt
+++ b/Sources/Crypto/CMakeLists.txt
@@ -96,7 +96,7 @@ add_library(Crypto
 target_compile_definitions(Crypto PRIVATE
   "$<$<COMPILE_LANGUAGE:Swift>:CRYPTO_IN_SWIFTPM>")
 
-if(CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Windows" OR CMAKE_SYSTEM_NAME STREQUAL "Android" OR CMAKE_SYSTEM_NAME STREQUAL "WASI")
+if(CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Windows" OR CMAKE_SYSTEM_NAME STREQUAL "Android" OR CMAKE_SYSTEM_NAME STREQUAL "WASI" OR CMAKE_SYSTEM_NAME STREQUAL FreeBSD)
   target_compile_definitions(Crypto PRIVATE
     "$<$<COMPILE_LANGUAGE:Swift>:CRYPTO_IN_SWIFTPM_FORCE_BUILD_API>")
 endif()
diff --git a/Sources/CryptoBoringWrapper/Util/RandomBytes.swift b/Sources/CryptoBoringWrapper/Util/RandomBytes.swift
index fc3970d0..0511c5fb 100644
--- a/Sources/CryptoBoringWrapper/Util/RandomBytes.swift
+++ b/Sources/CryptoBoringWrapper/Util/RandomBytes.swift
@@ -19,7 +19,7 @@ extension UnsafeMutableRawBufferPointer {
             return
         }
 
-        #if canImport(Darwin) || os(Linux) || os(Android) || os(Windows)
+        #if canImport(Darwin) || os(Linux) || os(Android) || os(Windows) || os(FreeBSD)
         var rng = SystemRandomNumberGenerator()
         precondition(count <= self.count)
 
diff --git a/Tests/CryptoTests/Encodings/DERTests.swift b/Tests/CryptoTests/Encodings/DERTests.swift
index 38bcfbca..02ce6bbd 100644
--- a/Tests/CryptoTests/Encodings/DERTests.swift
+++ b/Tests/CryptoTests/Encodings/DERTests.swift
@@ -49,7 +49,7 @@ class DERTests: XCTestCase {
     }
 
     func randomBytes(count: Int) -> [UInt8] {
-        #if canImport(Darwin) || os(Linux) || os(Android) || os(Windows)
+        #if canImport(Darwin) || os(Linux) || os(Android) || os(Windows) || os(FreeBSD)
         var rng = SystemRandomNumberGenerator()
         return (0..<count).map { _ in rng.next() }
         #else
diff --git a/cmake/modules/SwiftSupport.cmake b/cmake/modules/SwiftSupport.cmake
index 61e59309..bcdc194a 100644
--- a/cmake/modules/SwiftSupport.cmake
+++ b/cmake/modules/SwiftSupport.cmake
@@ -42,6 +42,8 @@ function(get_swift_host_arch result_var_name)
     set("${result_var_name}" "armv7" PARENT_SCOPE)
   elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "AMD64")
     set("${result_var_name}" "x86_64" PARENT_SCOPE)
+  elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "amd64")
+    set("${result_var_name}" "x86_64" PARENT_SCOPE)
   elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "IA64")
     set("${result_var_name}" "itanium" PARENT_SCOPE)
   elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "x86")