diff -Naur jdk12u-jdk-12.0.2+10.orig/src/java.base/unix/native/libjava/childproc.c jdk12u-jdk-12.0.2+10/src/java.base/unix/native/libjava/childproc.c
--- jdk12u-jdk-12.0.2+10.orig/src/java.base/unix/native/libjava/childproc.c	2019-07-16 18:38:28.000000000 +0200
+++ jdk12u-jdk-12.0.2+10/src/java.base/unix/native/libjava/childproc.c	2021-11-28 17:07:34.716995346 +0100
@@ -33,6 +33,7 @@
 
 #include "childproc.h"
 
+const char * const *parentPathv;
 
 ssize_t
 restartableWrite(int fd, const void *buf, size_t count)
diff -Naur jdk12u-jdk-12.0.2+10.orig/src/java.base/unix/native/libjava/childproc.h jdk12u-jdk-12.0.2+10/src/java.base/unix/native/libjava/childproc.h
--- jdk12u-jdk-12.0.2+10.orig/src/java.base/unix/native/libjava/childproc.h	2019-07-16 18:38:28.000000000 +0200
+++ jdk12u-jdk-12.0.2+10/src/java.base/unix/native/libjava/childproc.h	2021-11-28 17:07:49.040530118 +0100
@@ -118,7 +118,7 @@
  * The cached and split version of the JDK's effective PATH.
  * (We don't support putenv("PATH=...") in native code)
  */
-const char * const *parentPathv;
+extern const char * const *parentPathv;
 
 ssize_t restartableWrite(int fd, const void *buf, size_t count);
 int restartableDup2(int fd_from, int fd_to);