--- a/pform.cc	2026-11-15 04:25:36.209651629 +0000
+++ b/pform.cc	2026-11-15 04:32:28.541979480 +0000
@@ -3379,7 +3379,7 @@
 	    if (verbose_flag)
 		  cerr << "Executing: " << cmdline << endl<< flush;
 
-	    vl_input = popen(cmdline, "r");
+	    vl_input = 0; /* wasm: no subprocesses */
 	    if (vl_input == 0) {
 		  cerr << "Unable to preprocess " << path << "." << endl;
 		  return 1;
@@ -3429,7 +3429,7 @@
 
       if (vl_input != stdin) {
 	    if (ivlpp_string)
-		  pclose(vl_input);
+		  fclose(vl_input);
 	    else
 		  fclose(vl_input);
       }
--- a/ivlpp/lexor.lex	2026-11-15 04:25:36.056693910 +0000
+++ b/ivlpp/lexor.lex	2026-11-15 04:32:38.829504544 +0000
@@ -2018,8 +2018,8 @@
 
       if (verbose_flag) fprintf(stderr, "Invoke vhdlpp: %s\n", cmd);
 
-      isp->file = popen(cmd, "r");
-      isp->file_close = pclose;
+      isp->file = 0; /* wasm: VHDL not supported */
+      isp->file_close = fclose;
 
       free(libs);
       free(cmd);
--- a/vvp/main.cc	2026-11-15 04:25:36.238145450 +0000
+++ b/vvp/main.cc	2026-11-15 04:34:16.262786684 +0000
@@ -36,7 +36,7 @@
 # include  <pthread.h>
 #endif
 
-#if defined(HAVE_SYS_RESOURCE_H)
+#if defined(HAVE_SYS_RESOURCE_H) && !defined(__wasi__)
 # include  <sys/time.h>
 # include  <sys/resource.h>
 #endif // defined(HAVE_SYS_RESOURCE_H)
@@ -70,7 +70,7 @@
 
 static char log_buffer[4096];
 
-#if defined(HAVE_SYS_RESOURCE_H)
+#if defined(HAVE_SYS_RESOURCE_H) && !defined(__wasi__)
 static void my_getrusage(struct rusage *a)
 {
       getrusage(RUSAGE_SELF, a);