diff --git a/Makefile.in b/Makefile.in
index cac099f67..3abafbe55 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -150,8 +150,8 @@ endif
 clean:
 	$(foreach dir,$(SUBDIRS),$(MAKE) -C $(dir) $@ && ) true
 	rm -f *.o parse.cc parse.h lexor.cc
-	rm -f ivl.exp iverilog-vpi.man iverilog-vpi.pdf iverilog-vpi.ps parse.output
-	rm -f syn-rules.output dosify.exe ivl@EXEEXT@ check.vvp
+	rm -f ivl.exp iverilog-vpi.man iverilog-vpi.pdf iverilog-vpi.ps
+	rm -f parse.output syn-rules.output dosify.exe ivl@EXEEXT@ check.vvp
 	rm -f lexor_keyword.cc libivl.a libvpi.a iverilog-vpi syn-rules.cc
 	rm -rf dep
 	rm -f version.exe
@@ -244,15 +244,17 @@ lexor.o: lexor.cc parse.h
 
 parse.o: parse.cc
 
-parse.cc parse.h: $(srcdir)/parse.y
-	$(YACC) --verbose -t -p VL -d -o parse.cc $(srcdir)/parse.y
-	mv parse.cc.h parse.h 2>/dev/null || mv parse.hh parse.h
+# Build this in two steps to avoid parallel build issues (see pr3462585)
+parse.cc: $(srcdir)/parse.y
+	$(YACC) --verbose -t -p VL -d -o $@ $<
+parse.h: parse.cc
+	mv parse.cc.h $@ 2>/dev/null || mv parse.hh $@
 
 syn-rules.cc: $(srcdir)/syn-rules.y
-	$(YACC) --verbose -p syn_ -o syn-rules.cc $(srcdir)/syn-rules.y
+	$(YACC) --verbose -t -p syn_ -o $@ $<
 
 lexor.cc: $(srcdir)/lexor.lex
-	$(LEX) -s -olexor.cc $(srcdir)/lexor.lex
+	$(LEX) -s -t $< > $@
 
 lexor_keyword.o: lexor_keyword.cc parse.h
 
diff --git a/driver/Makefile.in b/driver/Makefile.in
index 7a1930bb9..c6f3e4922 100644
--- a/driver/Makefile.in
+++ b/driver/Makefile.in
@@ -79,11 +79,13 @@ dep:
 iverilog@EXEEXT@: $O
 	$(CC) $(LDFLAGS) $O -o iverilog@EXEEXT@ @EXTRALIBS@
 
-cflexor.c: cflexor.lex
-	$(LEX) -s -ocflexor.c $(srcdir)/cflexor.lex
+cflexor.c: $(srcdir)/cflexor.lex
+	$(LEX) -s -t $< > $@
 
-cfparse.h cfparse.c: cfparse.y
-	$(YACC) --verbose -t -d -o cfparse.c --name-prefix=cf $(srcdir)/cfparse.y
+# Build this in two steps to avoid parallel build issues (see pr3462585)
+cfparse.c: $(srcdir)/cfparse.y
+	$(YACC) --verbose -t -p cf -d -o $@ $<
+cfparse.h: cfparse.c
 
 %.o: %.c
 	$(CC) $(CPPFLAGS) $(CFLAGS) @DEPENDENCY_FLAG@ -c $< -o $*.o
diff --git a/ivlpp/Makefile.in b/ivlpp/Makefile.in
index 9245bf18e..226d5fb51 100644
--- a/ivlpp/Makefile.in
+++ b/ivlpp/Makefile.in
@@ -70,7 +70,7 @@ ivlpp@EXEEXT@: $O
 	$(CC) $(LDFLAGS) $O -o ivlpp@EXEEXT@ @EXTRALIBS@
 
 lexor.c: $(srcdir)/lexor.lex
-	$(LEX) -olexor.c $(srcdir)/lexor.lex
+	$(LEX) -s -t $< > $@
 
 install: all installdirs $(libdir)/ivl$(suffix)/ivlpp@EXEEXT@
 
diff --git a/vhdlpp/Makefile.in b/vhdlpp/Makefile.in
index 92b159fb6..b7c9115c8 100644
--- a/vhdlpp/Makefile.in
+++ b/vhdlpp/Makefile.in
@@ -110,9 +110,11 @@ parse.o: parse.cc
 lexor.cc: $(srcdir)/lexor.lex
 	$(LEX) -s -olexor.cc $(srcdir)/lexor.lex
 
-parse.cc parse.h: $(srcdir)/parse.y
-	$(YACC) --verbose -t -d -o parse.cc $(srcdir)/parse.y
-	mv parse.cc.h parse.h 2>/dev/null || mv parse.hh parse.h
+# Build this in two steps to avoid parallel build issues (see pr3462585)
+parse.cc: $(srcdir)/parse.y
+	$(YACC) --verbose -t -d -o $@ $<
+parse.h: parse.cc
+	mv parse.cc.h $@ 2>/dev/null || mv parse.hh $@
 
 lexor_keyword.o: lexor_keyword.cc parse.h
 
diff --git a/vpi/Makefile.in b/vpi/Makefile.in
index 45dd03fee..7ce19bd14 100644
--- a/vpi/Makefile.in
+++ b/vpi/Makefile.in
@@ -125,23 +125,27 @@ system.vpi: $O $(OPP) ../vvp/libvpi.a
 	$(CXX) @shared@ -o $@ $O $(OPP) -L../vvp $(LDFLAGS) -lvpi $(SYSTEM_VPI_LDFLAGS)
 
 sys_readmem_lex.c: $(srcdir)/sys_readmem_lex.lex
-	$(LEX) -t $(srcdir)/sys_readmem_lex.lex > sys_readmem_lex.c
+	$(LEX) -s -t $< > $@
 
 sdf_lexor.o: sdf_lexor.c sdf_parse.h
 
 sdf_lexor.c: $(srcdir)/sdf_lexor.lex
-	$(LEX) -t $(srcdir)/sdf_lexor.lex > sdf_lexor.c
+	$(LEX) -s -t $< > $@
 
-sdf_parse.c sdf_parse.h: $(srcdir)/sdf_parse.y
-	$(YACC) --verbose -d -p sdf -o sdf_parse.c $(srcdir)/sdf_parse.y
+# Build this in two steps to avoid parallel build issues (see pr3462585)
+sdf_parse.c: $(srcdir)/sdf_parse.y
+	$(YACC) --verbose -t -p sdf -d -o $@ $<
+sdf_parse.h: sdf_parse.c
 
 table_mod_lexor.o: table_mod_lexor.c table_mod_parse.h
 
 table_mod_lexor.c: $(srcdir)/table_mod_lexor.lex
-	$(LEX) -t $< > $@
+	$(LEX) -s -t $< > $@
 
-table_mod_parse.c table_mod_parse.h: $(srcdir)/table_mod_parse.y
-	$(YACC) --verbose -d -p tblmod -o table_mod_parse.c $<
+# Build this in two steps to avoid parallel build issues (see pr3462585)
+table_mod_parse.c: $(srcdir)/table_mod_parse.y
+	$(YACC) --verbose -t -p tblmod -d -o $@ $<
+table_mod_parse.h: table_mod_parse.c
 
 v2005_math.vpi: $M ../vvp/libvpi.a
 	$(CC) @shared@ -o $@ $M -L../vvp $(LDFLAGS) -lvpi $(VA_MATH_VPI_LDFLAGS)
diff --git a/vvp/Makefile.in b/vvp/Makefile.in
index beaf67387..4f3a59a80 100644
--- a/vvp/Makefile.in
+++ b/vvp/Makefile.in
@@ -157,11 +157,11 @@ parse.o: parse.cc
 
 tables.o: tables.cc
 
+# Build this in two steps to avoid parallel build issues (see pr3462585)
 parse.cc: $(srcdir)/parse.y
-	$(YACC) --verbose -t -d -o parse.cc $(srcdir)/parse.y
-
+	$(YACC) --verbose -t -d -o $@ $<
 parse.h: parse.cc
-	mv parse.cc.h parse.h 2>/dev/null || mv parse.hh parse.h
+	mv parse.cc.h $@ 2>/dev/null || mv parse.hh $@
 
 lexor.cc: $(srcdir)/lexor.lex
 	$(LEX) -s -olexor.cc $(srcdir)/lexor.lex