diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3960176..4424505 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -47,6 +47,27 @@ target_compile_definitions(wolftpm PRIVATE
     "BUILDING_WOLFTPM"
     )
 
+include(CheckIncludeFile)
+check_include_file("fcntl.h" HAVE_FCNTL_H)
+check_include_file("netdb.h" HAVE_NETDB_H)
+check_include_file("time.h" HAVE_TIME_H)
+check_include_file("sys/ioctl.h" HAVE_SYS_IOCTL_H)
+check_include_file("sys/socket.h" HAVE_SYS_SOCKET_H)
+check_include_file("sys/time.h" HAVE_SYS_TIME_H)
+check_include_file("errno.h" HAVE_ERRNO_H)
+check_include_file("stdint.h" HAVE_STDINT_H)
+check_include_file("stdlib.h" HAVE_STDLIB_H)
+check_include_file("string.h" HAVE_STRING_H)
+check_include_file("sys/stat.h" HAVE_SYS_STAT_H)
+check_include_file("sys/types.h" HAVE_SYS_TYPES_H)
+check_include_file("unistd.h" HAVE_UNISTD_H)
+
+include(CheckFunctionExists)
+check_function_exists("gethostbyname" HAVE_GETHOSTBYNAME)
+check_function_exists("getaddrinfo" HAVE_GETADDRINFO)
+check_function_exists("gettimeofday" HAVE_GETTIMEOFDAY)
+
+
 
 # TODO
 # * wrapper
@@ -245,6 +266,26 @@ file(APPEND ${OPTION_FILE} "#endif\n\n\n")
 file(APPEND ${OPTION_FILE} "#endif /* WOLFTPM_OPTIONS_H */\n\n")
 
 
+
+# generate config.h
+message("Generating config header...")
+set(WOLFTPM_CONFIG_H "yes" CACHE STRING
+"Enable generation of config.h and define HAVE_CONFIG_H (default: enabled)")
+set_property(CACHE WOLFTPM_DEBUG
+    PROPERTY STRINGS "yes;no")
+if(WOLFTPM_CONFIG_H)
+    add_definitions("-DHAVE_CONFIG_H")
+    configure_file("${CMAKE_CURRENT_SOURCE_DIR}/cmake/config.in"
+                   "${CMAKE_CURRENT_BINARY_DIR}/config.h" )
+    # If config.h exists, delete it to avoid a mixup with build/config.h
+    if (EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/config.h")
+        file(REMOVE "${CMAKE_CURRENT_SOURCE_DIR}/config.h")
+    endif()
+endif()
+
+
+
+
 if (WOLFTPM_EXAMPLES)
     add_tpm_example(activate_credential attestation/activate_credential.c)
     add_tpm_example(make_credential attestation/make_credential.c)
diff --git a/Makefile.am b/Makefile.am
index 6a316e3..90c1148 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -41,6 +41,7 @@ include tests/include.am
 include docs/include.am
 include wrapper/include.am
 include hal/include.am
+include cmake/include.am
 
 EXTRA_DIST+= README.md
 EXTRA_DIST+= ChangeLog.md
diff --git a/cmake/README.md b/cmake/README.md
new file mode 100644
index 0000000..a138be5
--- /dev/null
+++ b/cmake/README.md
@@ -0,0 +1,5 @@
+# wolfTPM CMake
+
+This directory contains some supplementary files for the [CMakeLists.txt](../CMakeLists.txt) in the root.
+
+See also cmake notes in the [INSTALL](../INSTALL) documentation file.
diff --git a/cmake/config.in b/cmake/config.in
new file mode 100644
index 0000000..8a0bc31
--- /dev/null
+++ b/cmake/config.in
@@ -0,0 +1,48 @@
+/* Define to 1 if you have the <fcntl.h> header file. */
+#cmakedefine HAVE_FCNTL_H @HAVE_FCNTL_H@
+
+/* Define to 1 if you have the <netdb.h> header file. */
+#cmakedefine HAVE_NETDB_H @HAVE_NETDB_H@
+
+/* Define to 1 if you have the <time.h> header file. */
+#cmakedefine HAVE_TIME_H @HAVE_TIME_H@
+
+/* Define to 1 if you have the <sys/ioctl.h> header file. */
+#cmakedefine HAVE_SYS_IOCTL_H @HAVE_SYS_IOCTL_H@
+
+/* Define to 1 if you have the <sys/socket.h> header file. */
+#cmakedefine HAVE_SYS_SOCKET_H @HAVE_SYS_SOCKET_H@
+
+/* Define to 1 if you have the <sys/time.h> header file. */
+#cmakedefine HAVE_SYS_TIME_H @HAVE_SYS_TIME_H@
+
+/* Define to 1 if you have the <errno.h> header file. */
+#cmakedefine HAVE_ERRNO_H @HAVE_ERRNO_H@
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#cmakedefine HAVE_STDINT_H @HAVE_STDINT_H@
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#cmakedefine HAVE_STDLIB_H @HAVE_STDLIB_H@
+
+/* Define to 1 if you have the <string.h> header file. */
+#cmakedefine HAVE_STRING_H @HAVE_STRING_H@
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#cmakedefine HAVE_SYS_STAT_H @HAVE_SYS_STAT_H@
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#cmakedefine HAVE_SYS_TYPES_H @HAVE_SYS_TYPES_H@
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#cmakedefine HAVE_UNISTD_H @HAVE_UNISTD_H@
+
+
+/* Define to 1 if you have the `getaddrinfo' function. */
+#cmakedefine HAVE_GETADDRINFO @HAVE_GETADDRINFO@
+
+/* Define to 1 if you have the `gethostbyname' function. */
+#cmakedefine HAVE_GETHOSTBYNAME @HAVE_GETHOSTBYNAME@
+
+/* Define to 1 if you have the `gettimeofday' function. */
+#cmakedefine HAVE_GETTIMEOFDAY @HAVE_GETTIMEOFDAY@
diff --git a/cmake/include.am b/cmake/include.am
new file mode 100644
index 0000000..ceec20a
--- /dev/null
+++ b/cmake/include.am
@@ -0,0 +1,2 @@
+EXTRA_DIST += cmake/README.md
+EXTRA_DIST += cmake/config.in
diff --git a/configure.ac b/configure.ac
index 134e6b7..7d2101e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -60,6 +60,7 @@ AC_CHECK_SIZEOF([long long], 8)
 AC_CHECK_SIZEOF([long], 4)
 
 # Check headers/libs
+AC_CHECK_HEADERS([netdb.h])
 AC_CHECK_FUNCS([gethostbyname getaddrinfo gettimeofday inet_ntoa memset socket])
 AC_CHECK_LIB([network],[socket])