https://bugs.gentoo.org/843437
https://www.virtualbox.org/changeset/94406/vbox

--- a/src/VBox/Runtime/Makefile.kmk
+++ b/src/VBox/Runtime/Makefile.kmk
@@ -324,4 +324,7 @@
 ifdef IPRT_WITH_FUTEX_BASED_SEMS
  RuntimeR3_DEFS.linux  += IPRT_WITH_FUTEX_BASED_SEMS
+endif
+ifdef IPRT_WITHOUT_PAM
+ RuntimeR3_DEFS        += IPRT_WITHOUT_PAM
 endif
 RuntimeR3_INCS         = \
--- a/src/VBox/Runtime/r3/posix/process-creation-posix.cpp
+++ b/src/VBox/Runtime/r3/posix/process-creation-posix.cpp
@@ -86,4 +86,5 @@
 
 #if !defined(IPRT_USE_PAM) \
+ && !defined(IPRT_WITHOUT_PAM) \
  && ( defined(RT_OS_DARWIN) || defined(RT_OS_FREEBSD) || defined(RT_OS_LINUX) || defined(RT_OS_NETBSD) || defined(RT_OS_OPENBSD) )
 # define IPRT_USE_PAM