diff --git a/renderdoc/os/posix/apple/apple_process.cpp b/renderdoc/os/posix/apple/apple_process.cpp
index ef3492719..11d87b237 100644
--- a/renderdoc/os/posix/apple/apple_process.cpp
+++ b/renderdoc/os/posix/apple/apple_process.cpp
@@ -38,7 +38,7 @@ char **GetCurrentEnvironment()
 
 rdcstr execcmd(const char *cmd)
 {
-  FILE *pipe = popen(cmd, FileIO::ReadText);
+  FILE *pipe = popen(cmd, "r");
 
   if(!pipe)
     return "ERROR";
@@ -183,7 +183,8 @@ bool OSUtility::DebuggerPresent()
 
 rdcstr Process::GetEnvVariable(const rdcstr &name)
 {
-  return getenv(name.c_str());
+  const char *val = getenv(name.c_str());
+  return val ? val : rdcstr();
 }
 
 uint64_t Process::GetMemoryUsage()
diff --git a/renderdoc/os/posix/ggp/ggp_process.cpp b/renderdoc/os/posix/ggp/ggp_process.cpp
index 8e9204640..9e2377794 100644
--- a/renderdoc/os/posix/ggp/ggp_process.cpp
+++ b/renderdoc/os/posix/ggp/ggp_process.cpp
@@ -194,7 +194,8 @@ bool OSUtility::DebuggerPresent()
 
 rdcstr Process::GetEnvVariable(const rdcstr &name)
 {
-  return getenv(name.c_str());
+  const char *val = getenv(name.c_str());
+  return val ? val : rdcstr();
 }
 
 uint64_t Process::GetMemoryUsage()
diff --git a/renderdoc/os/posix/ggp/ggp_stringio.cpp b/renderdoc/os/posix/ggp/ggp_stringio.cpp
index 2b0e8f7cb..a0a41f64a 100644
--- a/renderdoc/os/posix/ggp/ggp_stringio.cpp
+++ b/renderdoc/os/posix/ggp/ggp_stringio.cpp
@@ -85,7 +85,7 @@ rdcstr GetAppFolderFilename(const rdcstr &filename)
     homedir = getpwuid(getuid())->pw_dir;
   }
 
-  rdcstr ret = rdcstr(homedir) + "/.renderdoc/";
+  rdcstr ret = rdcstr(homedir ? homedir : "") + "/.renderdoc/";
 
   mkdir(ret.c_str(), S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
 
diff --git a/renderdoc/os/posix/linux/linux_process.cpp b/renderdoc/os/posix/linux/linux_process.cpp
index 981664108..40d10bc3a 100644
--- a/renderdoc/os/posix/linux/linux_process.cpp
+++ b/renderdoc/os/posix/linux/linux_process.cpp
@@ -658,7 +658,8 @@ bool OSUtility::DebuggerPresent()
 
 rdcstr Process::GetEnvVariable(const rdcstr &name)
 {
-  return getenv(name.c_str());
+  const char *val = getenv(name.c_str());
+  return val ? val : rdcstr();
 }
 
 uint64_t Process::GetMemoryUsage()