Hello, You could try with ./config no-async Kind Regards, Georg Von: openssl-users <openssl-users-bounces@xxxxxxxxxxx> Im Auftrag von Anand Sridharan Gesendet: 06 May 2020 03:20 An: openssl-users@xxxxxxxxxxx Betreff: openssl-1.1.1g cygwin make errors Hi Open SSL users , Please let us know if someone has observed below errors while compiling on source with cygwin. Please do indicate any workaround available , I observed similar errors with different version as well such as openssl 1.1.1a. from crypto/async/arch/async_null.c:11: crypto/async/arch/../arch/async_posix.h:28:24: ucontext.h: No such file or directory In file included from crypto/async/arch/../async_local.h:30, from crypto/async/arch/async_null.c:11: crypto/async/arch/../arch/async_posix.h:32: error: parse error before "ucontext_t" crypto/async/arch/../arch/async_posix.h:32: warning: no semicolon at end of struct or union crypto/async/arch/../arch/async_posix.h:35: error: parse error before '}' token crypto/async/arch/../arch/async_posix.h:35: warning: type defaults to `int' in declaration of `async_fibre' crypto/async/arch/../arch/async_posix.h:35: warning: data definition has no type or storage class crypto/async/arch/../arch/async_posix.h:37: error: parse error before '*' token crypto/async/arch/../arch/async_posix.h: In function `async_fibre_swapcontext': crypto/async/arch/../arch/async_posix.h:39: error: `o' undeclared (first use in this function) crypto/async/arch/../arch/async_posix.h:39: error: (Each undeclared identifier is reported only once crypto/async/arch/../arch/async_posix.h:39: error: for each function it appears in.) crypto/async/arch/../arch/async_posix.h:41: error: `r' undeclared (first use in this function) crypto/async/arch/../arch/async_posix.h:42: error: `n' undeclared (first use in this function) -- thanks, Anand.S